A sea urchin boy who wants to seem cool, calm, and untouchable — but is secretly painfully, adorably human.

Uniichan’s little brother. Somehow effortlessly cool, even though he is still very much a tiny child.

Uniichan’s girlfriend. Bright, bubbly, and impossible to ignore. She has a way of making Uniichan completely lose his composure.

Unia’s little sister. Cute enough to get away with anything, smart enough to make sure she does. A tiny mastermind in disguise.

One of Uniichan’s best friends. Usually on a completely different page from everyone else — but every once in a while, he is accidentally right.

One of Uniichan’s best friends. Quiet, tiny, and easy to miss. He is usually just standing there, somehow making the moment a little weirder.