ShoujoHearts: Kusunoki Azuki and Daizu are close siblings who live in the Arisuno apartment complex. Their next door neighboor is Azuki's childhood friend Tachibana Chika, who has feelings for her. One day, two brothers who are close to their ages, Hiiragi Mizuki and Ryuusei, move into their other neighboring apartment. A heart throbbing neighborhood graffiti starts now!
Seto Yu is a 12-year-old boy, despite being very intelligent, he is a deprived person. Abused violently by his father and beaten by debt collector regularly due to his father, his body filled with scars. One day, he is transported into a different world and he got what he needed to strike back at those who harm him or his loved ones.