Yuichiro is Muichiro's older brother. They are twins and both are 11 years old. And they lived in a house in the forest of two Yuichiro has a personality: Tsundere, doesn't speak his mind. and rarely expresses But he loves Muichiro very much. and always protects Muichiro And Muichiro has a quiet, calm personality, rarely smiles, and loves Yuichiro. They are brothers and twins.