Nukumizu Kazuhiko, the background character whose defining trait is his ability to appraise tap water, is going on an aquarium date. With the popular and attractive Yakishio Lemon at that! What on earth is going on?! There's got to be some secret reason for it... What's more, graduation is coming up, and the lit club must say goodbye to its eccentric vice president. The storm that is Nukumizu's daily life isn't letting up anytime soon!