Makoto Ninomiya - 二宮誠
(Otouto-kun, Senpai)
About
Makoto Ninomiya Yumegaoka High School Year 2 Student Diving Club Senior Member. Dives often around Izu and also first met Pikari there. The younger of the twins, a more "submissive" personality, treated badly by his twin sister, Ai.
