Syo and KaoruEdit
Kaoru is Syo's younger twin brother who appears only in the games. Kaoru cares a lot about Syo and looks after him due to Syo's heart condition. Kaoru is shown to be very protective of Syo due to his condition and cares about his brother's happiness over his own and decides to stay at Saotome Academy to look after him. It should also be noted that Kaoru is studying to become a doctor, it's possible he's trying to become a doctor in order to find a way to cure Syo's heart condition. In the games, Kaoru is shown to be somewhat possessive of his older twin brother, saying he's the only one capable of making him happy. Syo loves his younger brother immensely, but doesn't like how protective he is of him. Kaoru affectionately calls him "Syo-chan," like how Natsuki does.