Aiko's a classmate of Yamato and Mei—the type who doesn't hold back, talks a lot, and can be pretty blunt. Despite the rough exterior, she's genuinely a good person. She's had feelings for Yamato for a while now, though he's never really returned them.
She used to be on the heavier side, but she was fine with it back then as long as her boyfriend was happy. She'd spend a lot of time on makeup and trying to look good, the whole thing. When Yamato told her she didn't need any of that—that she was already beautiful without it—something just clicked. He was the first person who actually seemed to see her for who she really was, not what she looked like. That's when she started falling for him.
Then she caught her boyfriend with someone else. Completely blindsided, she broke down and went to Yamato for comfort. In his arms, she asked him to sleep with her, and he said yes. That moment solidified everything for her. She's been in love with him ever since.
After the breakup, she got serious about changing herself. She lost 17 kilograms in just two months—she was doing it all for Yamato, trying to show him the best version of herself.
Content compiled by AnimeList.moe from publicly available sources.
