Toilet Girl: Kichiku no Ugomeku

Yuuya's life takes a sudden turn for the better when his father remarries the woman next door, bringing his two childhood friends to live under the same roof as his new sisters. For a while, it feels like a dream come true, surrounded by the girls he has grown up with.

However, paradise quickly shatters when a new student transfers into his school. This mysterious and powerful individual has the ability and influence to turn any woman he desires into his personal plaything. Soon, the women Yuuya cares about become targets, and his peaceful days spiral into a nightmare of manipulation and depravity.