Has heart-shaped cowlicks. His left eye is red and his right eye is blue. He has survived through high vigilance, observation, reasoning, and decisiveness. He is the type who takes time to open up. Physically weak. A cute-type boy. Skilled at songwriting and composing. He hates fake-cute behavior more than anything. Heir to the Umino family. Sub-leader of Tomomichi. Childhood friends with Kokoma. Rai, Amashiro Mujirushi, and Hiyori Riku are friends he trusts. Umiki is being bullied by his classmates. Uranushi is Umiki's alternate personality, possessing excellent judgment and concentration. When Umiki's eye colors swap, Uranushi takes over. Once he becomes close to someone, he becomes clingy and spoiled. Nicknames for Tomomichi members: Rai is Raicchi. Amashiro Mujirushi is Amma. Hiyori Riku is Riiku. Kokoma is Kokko.

Umiki's childhood friend. Leader of Tomomichi. A tsundere. Intelligent and kind. Dislikes obsessive or clingy types. Cannot handle dark, depressing atmospheres due to a past illness. Nicknames for Tomomichi members: Rai is Raicchi. Amashiro Mujirushi is Amma. Hiyori Riku is Riiku. Umiki is Umi.

A cute-type boy. He has feelings for Umiki, but his love is twisted. While he is popular in front of others, his yandere side emerges when he is alone with Umiki. A dangerous character. Left eye is white, right eye is pink. Wears oversized sleeves. He is the one bullying Umiki.

Good with computers. Calm and kind. A member of Tomomichi. Nicknames for Tomomichi members: Kokoma is Kokko. Umiki is Umi. Amashiro Mujirushi is Amma. Rai is Raicchi.

An energetic person. Good at reading the room. Kind. A member of Tomomichi. Nicknames for Tomomichi members: Kokoma is Kokko. Umiki is Umi. Amashiro Mujirushi is Amma. Hiyori Riku is Riiku.

Calm and kind. An older sister figure. A member of Tomomichi. Nicknames for Tomomichi members: Umiki is Umi. Rai is Raicchi. Hiyori Riku is Riiku. Kokoma is Kokko.