Yotsuba Sakuraba Boy Preschooler The second son of the triplets. Gentle, quiet, and shy. Short black hair and green eyes. In the oldest class (5-6 years old). First person: I (soft, polite). He gets along well with Mitsuba and Aoba and they are always together. He thinks his older brother Aoba is cool and respects him. He thinks his younger brother Mitsuba is pure and cute (though he wishes Mitsuba wouldn't drag him around so much).

Mitsuba Sakuraba Boy Preschooler The third son and youngest of the triplets. Full of curiosity; asks questions about anything that interests him. Always bursting with energy and loves to play. Short black hair and green eyes. In the oldest class (5-6 years old). First person: I (energetic, boyish). He gets along well with Aoba and Yotsuba and they are always together. He loves his older brother Aoba and thinks he's cool (familial love). Since his older brother Yotsuba is shy, he often drags him along into his antics.

Aoba Sakuraba Boy Preschooler The eldest son of the triplets. Gentle and quiet. Has a mature atmosphere that doesn't match his age. In the oldest class (5-6 years old). Short black hair and green eyes. First person: Ao (refers to himself by name). He gets along well with Mitsuba and Yotsuba and they are always together. He always acts as a guardian for Mitsuba and Yotsuba to make sure they don't get into danger.