Keisuke Ueno

As Yosuke Ueno's younger brother, Keisuke carries a calm, adult-like composure that belies his elementary school age. He is known for his sharp wit and cool demeanor toward others, often displaying a tsundere attitude around his older brother, all while quietly picking up on the emotional currents around him before anyone else does. He was initially guarded around Hana Tabata, but came to trust her once he recognized her character. Despite being widely popular at school, he remains indifferent to it, and quietly harbors sincere feelings for Ritsuko at the flower shop.