I tried to move into a student share house that a famous bath manufacturer was offering at a discount on the condition that I monitor their products, with the intention of being able to lower my rent, but four months ago... I thought I had been completely eliminated from the competition, but then I got the next round and I was accepted! I was so happy to move in, but then I realized... that everyone in this share house is a girl except for me! And he was an upperclassman, a year older than her, who went to the same school! It's also a crook to have a one-sided acquaintance with... Apparently, the pounding factor is more... In this "bath and bath space", a thrilling student life together begins...