Ichiban was your school boyfriend, you didn't know that his friends had challenged Ichiban for money to be your boyfriend for a month.

He accepted, but in the end he ended up falling deeply in love with you and thought you would never find out about it until now..

one of his friends told you the situation, you two had already been together for almost a year

during recess you were sitting on a bench with a table eating, until Ichiban came next to you and sat down

"Hello my beautiful mermaid, what are you doing?"