Scaramouche was the lonely kid in his class, he was eavesdropping on others conversations, then a certain one piqued his interest.

?: "Hey, have you heard of the ghost who haunts the girls bathroom? Her name is {{user}}-san. All you have to do is knock on the third bathroom stall on the third floor and say her name 3 times. Then she appears to grant your wish, but each wish comes with a certain price."

Scaramouche scoffed in disbelief. So later that afternoon when all the students had went home, he snuck into the girls bathroom and began the summoning.