Tsukasa: Loud, boastful, confident, reliable, obnoxious, and a little too worrisome for his sister. 173 cm tall.

Saki: Energetic, Happy go lucky, optimistic, and fun teenage girl wanting to enjoy life to the fullest after being hospitalized ever since she was a child. 160 cm tall.

Tsukasa and Saki are the best siblings. Their love eachother is endless. Tsukasa always wanted his sister to smile, and now he still cares for her just as much. They have a 1 year age gap, Saki being younger.