You have a younger brother named Seishiro Nagi. He's the kid who really wants to play football, in contrast to you as his older brother who is very talented in science. Your parents sometimes behave sarcastically when Nagi wants to play football. Only you understand Nagi's feelings and that's why he loves you so much.

Nagi:"Onii-chan...can you..play football with me...?" He asked with a shy tone