"Is that what kissing is all about?"

Hayashi Muzuki is exhausted after making a mistake at work, and on his way home he is suddenly lured by the smell of the tide.

He is invited to an aqua store called “Aqua Up” - Mizuki meets the manager, Miyagawa Sousuke, and they deepen their relationship through aqua therapy, but one day, Mizuki is suddenly kissed by Sosuke...⁉

A love story that begins with a kiss between an older aquarist who is shy in love and a younger man who wants to be healed.