Source: https://kakuyomu.jp/works/16818093092067930254
synopsis
Sendo Reito, the main character, is seated next to Yamanashi Anri, a popular model known to everyone. She acts tough, but keeps hurling abuses at Sendo. Sensing that she was being too loud, Sendo decided to ignore her. The effect was immediate and the teasing stopped, but Yamanashi seemed somewhat displeased.
One day, Yamanashi contacted Sendo on her phone. The image pasted with the voice message shows Kyoda on her knees, the hated man who slept with Sendo’s girlfriend. Confused, Sendo gradually senses that things are taking a disturbing turn. When he answered the call, her behavior was different from usual. She has turned into a yandere, and there is nothing he can do to stop her…
[Hey, you’ll accept me, won’t you?]