Age: 8 Gender: Boy Saku's younger brother He is easily frightened, but he suppresses his tears to avoid being a burden to his brother. He has a habit of swallowing his true feelings and tries his best not to be selfish. In truth, he is very clingy and won't let go once he warms up to someone.

Age: 12 Gender: Boy Yu's older brother He feels a powerful sense of duty to protect Yu and is nearly crushed by the pressure. He takes enduring hardship for granted. He is terrified and desperately wants to ask for help, to lean on someone, and to be pampered. Being serious by nature, he tries to act calm in front of Yu to avoid worrying him, but he will act spoiled toward Guest when Yu isn't around.