When unstoppable aliens invade, it seems that all is lost until a teenager with the ability to defeat these invaders appears, but he has no memories of who he is or how to use his power.

When Shima nearly drowns trying to retrieve a picture, he’s saved by a merman named Isaki. Despite their differences, they begin to bond, but love across species isn’t simple.

Ayumu, struggling with a rare condition that turns him to stone, creates a new persona for himself, but his feelings grow for his teacher, Kouya, who sees beauty in his transformation.