Grope - Yami no naka no Kotoritachi

Following an earthquake that collapses the school, only four students survive: childhood friends Fubuki and Shinichi, along with Takahaki and a junior girl. Both Shinichi and Takahaki harbor feelings for Fubuki, though she only returns Shinichi's affection. Takahaki fabricates a story, telling Fubuki that Shinichi is interested in the junior girl, who does indeed like Shinichi. This creates suspicion between the childhood friends. Takahaki exploits the resulting discord, proceeding to sexually assault both the junior girl and Fubuki. Shinichi is left isolated and confused by the events.