Oujodere...Explanation: all of Mystic Fragrance's story LOL
Tldr Aranee got immensely jealous that Kunugi-sensei started wearing Mystic Fragrance brand due to another woman, especially since it's because of Kunugi-sensei that Arashi started wearing the brand too. So of course, she put together a plan to get Kunugi-sensei to change to the new fragrance because of her, so Arashi would replace that "woman" in his life. If that ain't Oujodere idk what is