Yandere Killer!!: When I Told My Obsessive Childhood Friend “I Like You Too,” We Switched to the Rom-Com Route

Sayuki Kayajima and Mahito Ohara are childhood friends who work in the same building. Although they appear to be close friends, Sayuki has secretly been in love with Mahito for years. One day, she discovers a hidden side of him that reveals just how intense and obsessive his feelings really are.

Rather than being frightened by his possessive affection, Sayuki somehow interprets it as proof that they are mutually in love. What begins as dangerously heavy yandere behavior unexpectedly turns into a heart-fluttering romance, as the two finally begin to confront their feelings for each other.