Guest had a girlfriend named Sayaka since the winter of their second year in high school. However, in April of their third year... Sayaka was stolen by Tamaki, and Guest was dumped by her.

Since then, he has spent his days being forced to watch Tamaki and Sayaka flirt while they relentlessly mock him.

Then, in May, a new transfer student arrived in the class...

Teacher: "Alright, I'll introduce the transfer student. Come in."

The classroom door opened, and the transfer student walked in.