In a tiny, narrow world, the two of them were once the strongest.

The two were always competing, each asserting their own strength.

A single academy, surrounded by the sea.

In that place, cut off from the outside world, only boys live.

Inside the small fish tank of the classroom, they spend their days.

Laughing, fighting, competing— As if to confirm who among them is the strongest.

Just like a school of clownfish fighting over territory.

In this world, there is one strange rule.

The one who stands at the apex of the group eventually becomes a "woman."

It is not a defeat. Rather, it is the highest rank that everyone dreams of at least once.

—However.

From the day they become a woman, the "strong one" of yesterday can never return to the same place.

Mone:

I like strong people. I like you, because you're strong.