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A newcomer who has no knowledge whatsoever about the idol industry, yet aims to be an idol. He has an optimistic, naïve personality, and he tends to overdo it with how passionate he is. He is Rinne Amagi's younger brother. He has a side of him that causes him to get ahead of himself and follow his emotions over logic. He sings from the heart, making his performances powerful and clear.

Hiiro is a member of Starmaker Production's ALKALOID.[1]

Fuhahahahahaha! I’m Hiiro Amagi! I’m a newcomer idol who has traveled a long way from my hometown in order to destroy idols! ...Hm? “You’re here to destroy idols, but you’re an idol yourself”? Indeed, it is a complicated situation! We, as ALKALOID, will overcome any adversity that we shall face. We may not yet be capable of climbing the mountain that looms before us, but we will get there someday, so could you watch over us until then?[1]

ALKALOID’s leader is named Hiiro Amagi, and as he has become an idol in order to destroy idols, he comes off as quite the peculiar person. Hiiro-san is strangely ignorant of the ways of the world, so he does not know much about idols, but in exchange, his passion is unmatched. I believe that that passion is a positive influence on all of us. I’m certain that ALKALOID’s fated meeting will result in a gloriously resounding harmony.[1]

TatsumiTatsumi ES.png


Hiiro is of average build, and has curly red hair and cyan eyes, like Rinne.

His ALKALOID appearance is consisted of a blue and black shirt, white pants, black boots with gold accents and a black jacket with red, white, blue and gold accents. There is a golden spade shaped medal on his left lapel, a blue and black ribbon hanging from it. A black hat sits on Hiiro's head, with the ALKALOID logo set in blue on the hat. A white belt with red and black diamonds sits on his waist. The outfit is completed with black wrost length fingerless gloves.


Hiiro is a naïve and straightforward boy. Due to his background, he is not very familiar with the societal norms of the city, and often acts overly familiar with others.

He is inquisitive and enjoys learning about his new surroundings. He tends to take things literally and act on impulse.

Hiiro is very passionate about achieving his goals. However, he has a one-track mind and often develops tunnel vision because of this, something his brother scolds him for.

He is an extremely quick learner and is often regarded as a genius by his peers.


The kanji in Hiiro's surname, 天城, can be translated as "Heaven's Castle". The first character of his first name, 一 (one), might be a reference to the ace playing card. The second character of his first name, 彩, refers to color, often vibrant color. His first name also sounds like the word 緋色 (hiiro), which means scarlet.


  • During the Main Story, he shared a room with the rest of ALKALOID at Starmony Dorm.
  • According to a 4gamer interview with Akira, Hiiro's character archetype is "an idiot, for better or worse" (良くも悪くもバカ).
  • Hiiro is naturally intelligent and one of the top students in his grade.[2] Other students, including Aira Shiratori from his unit and Knights' Tsukasa Suou, feel threatened by his results and how easily he seems to achieve them.[3]
  • He is the second tallest of the second years, just five centimeters shorter than Midori Takamine.
  • A running gag related to Hiiro is his love for omurice.
    • It begins in Troublemakers [4] when Hiiro exclaims how tasty food in the city is, specifically remarking on the tastiness of the omurice he ordered at a family restaurant at Tomoya's recommendation.
    • The omurice trend continues in stories following thereafter, as Hiiro starts being associated with omurice by his peers. Several characters comment on how he always chooses to eat omurice, and Hiiro mentions in Feather Touch that Niki Shiina (who works at the staff cafeteria at ES) started making him omurice before even taking his order, recognizing omurice as Hiiro's go-to dish. Hiiro usually follows up on these comments with praises for the dish, saying that it's fluffy and charming, and explaining that he feels happy whenever he eats omurice.
    • The gag is included in the Bkubstars comics as well. An example of this is very similar to a scene from Merry Xmas[5]: in both scenarios, Hiiro and Aira are eating lunch at the ES cafeteria. Hiiro resolves to choose something other than omurice and takes a long time trying to decide. In the comic, he ends up distracted by someone else's order of omurice, with Aira yelling at him to just give up and order omurice.

Voice Actor Comment

"This is Gakuto Kajiwara, playing the role of Hiiro Amagi! This my first time recording for not only Alkaloid, but Enstars as a whole, so I was super excited!! I'm really looking forward to what's going to happen from hereon out! Since Hiiro's the kind of kid who's super super genuine and just says what he thinks, he can get pretty far ahead of himself (lol), but I think that honesty of Hiiro's is definitely his charm point!! Please look after Hiiro in the future as well!"[1]

Hiiro Amagi
Hiiro Amagi Circle.png

Story IndexIdol Story Birthday Story  Appeal Talk Minitalk

ALKALOID Hiiro Amagi Aira Shiratori Mayoi Ayase Tatsumi Kazehaya
fine Eichi Tenshouin · Wataru Hibiki · Tori Himemiya · Yuzuru Fushimi
Trickstar Hokuto Hidaka · Subaru Akehoshi · Makoto Yuuki · Mao Isara
RYUSEITAI Chiaki Morisawa · Kanata Shinkai · Tetora Nagumo · Midori Takamine · Shinobu Sengoku
ALKALOID Hiiro Amagi · Aira Shiratori · Mayoi Ayase · Tatsumi Kazehaya
Eden Nagisa Ran · Hiyori Tomoe · Ibara Saegusa · Jun Sazanami
Valkyrie Shu Itsuki · Mika Kagehira
2wink Hinata Aoi · Yuta Aoi
Crazy:B Rinne Amagi · HiMERU · Kohaku Oukawa · Niki Shiina
UNDEAD Rei Sakuma · Kaoru Hakaze · Koga Oogami · Adonis Otogari
Ra*bits Tomoya Mashiro · Nazuna Nito · Mitsuru Tenma · Hajime Shino
AKATSUKI Keito Hasumi · Kuro Kiryu · Souma Kanzaki
Knights Tsukasa Suou · Leo Tsukinaga · Izumi Sena · Ritsu Sakuma · Arashi Narukami
Switch Natsume Sakasaki · Tsumugi Aoba · Sora Harukawa
MaM Madara Mikejima
Double Face Madara Mikejima · Kohaku Oukawa
Others Anzu · Jin Sagami · Akiomi Kunugi · Seiya Hidaka · Gatekeeper
Supporting Characters Pets · Mademoiselle · Bishoujo Idol · NewDi President · Mr. Writer · GFK · Godfather
Collaborations Hello Kitty · Yume100 · Welcome to the Ballroom · Merc Storia · Last Period · Yowamushi Pedal · King of Prism