Hametsu no Kanojo

Reiko, Kazu, and Yukari have a strong bond as childhood friends. Reiko considers herself the "big sister" of the group and views them as a family, even though she suppresses her romantic feelings for Kazu. Meanwhile, Yukari also harbors feelings for Kazu. This dynamic eventually leads to a gradual deterioration of their friendship, culminating in a disturbing tale of psychopathic love among youths.