Shinomiya Tsutomu

Tsukasa's younger brother who is a second-year high school student. He's devoted to basketball but is concerned about his short stature. Although he makes an effort to go to bed early, his growth spurt has not yet begun.

He used to really love his brother, but in junior high school he entered a rebellious phase. He still really likes him, but because they're so distant, he can't be honest with him. His goal this year is to have skinship like the old days.