Koga Oogami/Relationships

Aira Shiratori




Hajime Shino


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Hiiro Amagi




Hinata Aoi


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 * Fellow members of the Light Music Club. Koga cares for both of the Aoi twins as he is their upperclassman. He tags along with them to help train Tori during Circus.

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Mitsuru Tenma


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 * Recognized as a member of the same unit of his club vice-captain, Adonis, Mitsuru was quick to get close with him. Until he snapped back at Mitsuru during Sports Festival, he has stated that he is scary and will no longer go near him.

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Tomoya Mashiro


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 * During Summer Camp, Koga helps train Tomoya in a harsh manner. As harsh as Koga acts during the training session and draining Tomoya's stamina, he shows his care this way and dances to a song closer to songs "Ra*bits" usually sing and making the steps easier for Tomoya to dance with.

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Tsukasa Suou


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Yuta Aoi


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 * Fellow members of the Light Music Club. Koga cares for both of the Aoi twins as he is their upperclassman. He tags along with them to help train Tori during Circus.

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Arashi Narukami
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 * Arashi often gets clingy with Koga, and Koga often rebuffs her. He refers to Arashi harshly.


 * In the next year, Koga changes how he refers to Arashi, stating that he doesn't like seeing how pained she looks when he calls her "okama bastard". This implies that their relationship has improved by then.

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Hokuto Hidaka
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Makoto Yuuki
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 * Koga has helped train Makoto with his stamina, however as a result of this, he has become afraid of him.

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Mao Isara
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Mayoi Ayase
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Mika Kagehira
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Ritsu Sakuma
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 * Ritsu's classmate from 2-B. Ritsu enjoys teasing Koga, calling him "Corgi" and generally being playfully mean to him. In Dark Night Halloween, Ritsu teases Koga plenty by making him eat his sweets, and do things like sing and dance for him, as well as call him "Master" and get walked by him.

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Subaru Akehoshi
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 * Though Koga is seen much more often with Subaru's dog, rather than Subaru himself, the two have a relatively decent relationship, with Koga often telling Subaru to keep Daikichi on a leash.

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Tatsumi Kazehaya
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 * Tatsumi and Koga share a dorm room together. To their surprise they get along quite well and enjoy gardening together.

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Izumi Sena
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Kaoru Hakaze
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 * They are both members of the same unit. It often comes across as if Koga outright dislikes Kaoru, calling him "Player Bastard" or hesitating to add senpai to his name. Despite this, he has also shown moments of worry and genuine care for Kaoru as well. In the substory The Boy and The Sea, he goes as far as offering his apartment as a place for Kaoru to stay to avoid his family troubles.

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 * Kaoru has shown significant change of attitude towards Koga. In Nightless City Live, he notices Koga seems troubled and begins investigating, worried that his junior got himself involved with troublesome crowd. Kaoru goes as far as to pretend he's on a date with Koga to drag him away from suspicious-looking people he was arguing with and took him to the livehouse the Hakaze family manages. They've shown mutual support and understanding, bonding over their experiences and promising to be honest and rely on each other.

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Leo Tsukinaga
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Nazuna Nito
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Rei Sakuma
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 * Rei and Koga had an extensive history together, which started from the moment Koga joined Yumenosaki Academy when Rei was in his second year.


 * In Crossroad, it was shown that Koga held Rei in extremely high regard, to the point that Rei's rock-like image inspired him to pick up music. Rei soon found himself followed by his junior everywhere since the first day of school.  Because Koga followed Rei's scent to find him, Rei compared Koga to a dog, and called him "Doggie" (Wanko). While Rei's treatment toward Koga is avoidant at first, he eventually showed care and concern for Koga's growth and responded to his desperate attempts at make Rei mentor him. However, he soon found himself needing to go overseas, so Rei asked Kaoru, who managed a livehouse, to introduce Koga to a certain rock band and make sure he received proper training and a chance to stand on stage while Rei himself was too busy to oversee Koga's progress. Koga, however, waited for Rei to come back and tutor him properly. Koga also took Keito's criticism of Rei personally, ready to fight him for when he insulted his idol.
 * In Crossroad, it was shown that Koga held Rei in extremely high regard, to the point that Rei's rock-like image inspired him to pick up music. Rei soon found himself followed by his junior everywhere since the first day of school.  Because Koga followed Rei's scent to find him, Rei compared Koga to a dog, and called him "Doggie" (Wanko). While Rei's treatment toward Koga is avoidant at first, he eventually showed care and concern for Koga's growth and responded to his desperate attempts at make Rei mentor him. However, he soon found himself needing to go overseas, so Rei asked Kaoru, who managed a livehouse, to introduce Koga to a certain rock band and make sure he received proper training and a chance to stand on stage while Rei himself was too busy to oversee Koga's progress. Koga, however, waited for Rei to come back and tutor him properly. Koga also took Keito's criticism of Rei personally, ready to fight him for when he insulted his idol.


 * Rei, Koga and Keito then formed a unit called DEADMANZ together - created on Keito's request. Right before the concert, Rei gifted Koga with his own guitar, which Koga later claimed to protect with his life. During DEADMANZ’ live, Keito noticed that Rei and Koga seemed to communicate through eye-contact only and they power up just by being next to each other, and he called it “true love”. The following summer, the two of them got together to create UNDEAD with Adonis and Kaoru. The name of the unit itself was Koga's tribute to Rei's struggle and a call to him to keep living with them.


 * Once Rei changed his entire persona and begun acting like an old man, it personally hurt Koga, who had admired him to the point of adapting Rei's rough, delinquent-like speech pattern. From that point their relationship changed drastically, at least on the surface. Koga became more aggressive toward Rei and called him "Vampire Bastard" instead of "Sakuma-senpai". Rei, on the other hand, treated Koga like a wild dog that he owns, and went so far as to call himself Koga's owner. He would even tie Koga up or asked Adonis to do so to keep him in check. Despite their relationship getting rough, they still seemed to spend most of their time together and Koga obediently followed Rei's decisions and trusted his judgement. Rei also treated Koga with affection and teased him constantly. He tended to drag Koga into his coffin as well.
 * Once Rei changed his entire persona and begun acting like an old man, it personally hurt Koga, who had admired him to the point of adapting Rei's rough, delinquent-like speech pattern. From that point their relationship changed drastically, at least on the surface. Koga became more aggressive toward Rei and called him "Vampire Bastard" instead of "Sakuma-senpai". Rei, on the other hand, treated Koga like a wild dog that he owns, and went so far as to call himself Koga's owner. He would even tie Koga up or asked Adonis to do so to keep him in check. Despite their relationship getting rough, they still seemed to spend most of their time together and Koga obediently followed Rei's decisions and trusted his judgement. Rei also treated Koga with affection and teased him constantly. He tended to drag Koga into his coffin as well.


 * In his third year at Yumenosaki, Rei is quite protective and caring of Koga. He tried his best to guide him properly, even if it’s through "tough love," as he figured spoiling Koga constantly isn’t true love. Rei said that despite coming off harsh at first, he has a soft spot for Koga. He believed in Koga’s skills and wanted to see him smile. Watching Koga grow independent and confident in his abilities has made Rei sob. Wataru, one of Rei's fellow Oddballs, refered to Koga as Rei’s ‘favourite kid… favourite puppy’. On multiple occasions, Rei has asked Koga to take care of his adored little brother - Ritsu, indicative of the amount of trust he has placed in Koga. In later stories, Koga showed that he still looked up to Rei, although in a “healthier” way. In The Four Beasts of Fistfighting, he mentions that he greatly regreted idolizing Rei and treating like a higher being. He realized it was the opposite of what he needed at the time. Koga also threw guitar picks into a fountain after he heard from Rei that it granted wishes, and he wished to remain with Rei forever.


 * During Repayment Festival, they came across one of their biggest conflicts— Rei's decision to disband UNDEAD upon his graduation. Before the live, Rei mused about how Koga had grew so much since their first meeting when he was just an “adorable puppy”; how he stayed by his side and supported him even though he couldn’t possibly understand what was going on in the beginning. He also claimed Koga could now make his wish come true. Despite misunderstanding each other at first, thanks to many of their friends' effort, they faced each other properly on stage and aimed to become equals. Rei admitted separating himself from his “beloved doggie” was more painful than tearing his body apart. Kaoru commented on how excited Rei was to face Koga properly after all they went through. Rei called Koga by his name, asking if it's alright, while Koga finally told Rei how much he loved him and how much Rei affected him, propelling the both of them into a new stage in their relationship.
 * During Repayment Festival, they came across one of their biggest conflicts— Rei's decision to disband UNDEAD upon his graduation. Before the live, Rei mused about how Koga had grew so much since their first meeting when he was just an “adorable puppy”; how he stayed by his side and supported him even though he couldn’t possibly understand what was going on in the beginning. He also claimed Koga could now make his wish come true. Despite misunderstanding each other at first, thanks to many of their friends' effort, they faced each other properly on stage and aimed to become equals. Rei admitted separating himself from his “beloved doggie” was more painful than tearing his body apart. Kaoru commented on how excited Rei was to face Koga properly after all they went through. Rei called Koga by his name, asking if it's alright, while Koga finally told Rei how much he loved him and how much Rei affected him, propelling the both of them into a new stage in their relationship.


 * In Athletics, Rei expressed he still feels embarrassed about referring to Koga by his first name and was scolded by his junior when he changed back to “Doggie” (Wanko). In Operetta, Rei, despite being a graduate already, he came back to Yumenosaki and asked Koga for advice regarding Ritsu, which showed how he began treating Koga as someone who didn't only rely on him, but also a person he could rely on.
 * In Athletics, Rei expressed he still feels embarrassed about referring to Koga by his first name and was scolded by his junior when he changed back to “Doggie” (Wanko). In Operetta, Rei, despite being a graduate already, he came back to Yumenosaki and asked Koga for advice regarding Ritsu, which showed how he began treating Koga as someone who didn't only rely on him, but also a person he could rely on.

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Shu Itsuki
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Akiomi Kunugi
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Jin Sagami
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