Ryugu is a small town under the sea. Aside from the fact that everything is, well, underwater, it's just like every other small town. Classmates Masora and Sumire are like every other middle school girls, sw...

Ryu stows away on a space vessel, only to be found by the crew when it's far to late to return to earth. So they stick him in a spare sleep capsule instead. Things take a turn for the unexpected, however, wh...