Yandere Koroshi!! Shuuchaku Yaba me no Osananajimi ni "Watashi mo Suki" to Tsutaetara, Lovekome Route ni Shift shimashita

Sayuki Kayashima has had a crush for her childhood friend Mahito Oohara for a long time. Until one day when she discovers Mahito's "true nature." ("I'm going to thoroughly make sure Sayuki is all mine" ………Wait, does that mean we've actually loved each other all this time!?!?) The overwhelming love of the yandere boy is suddenly converted into sweet, passionate love between them!? What will happen with this unpredictable romance? It's a unique blend of yandere (?) erotic love comedy! (Source: Shogakukan, translated)