Hiro and Mellie have decided to team up for the next adventure exam.

He has no idea what she's thinking, and he's not sure what she's feeling. In addition to this, she has zero caution towards the opposite sex. ... Hiro spends his days being bewildered by Mellie's bold behavior.

One night after unison practice, Hiro sees Mellie bathing in the spring behind the school.

Mellie's naked body is illuminated by the moonlight. When Mellie noticed Hiro, she said with the same expressionless face.

I've found someone to marry.