Satoshi Honma is the son of Manabu Honma and Irène Honma and the younger brother of Meiko "Menma" Honma who didn't have that many memories of Menma since she died from an accident when he was still little. He always wanted to join his older sister whenever she would go outside. However, Menma would tell Satoshi to stay and guard their house. Satoshi is a warm-hearted young boy and he is still the same in a way, even though Irène Honma (Satoshi's mother) does not notice him. He was also brave to face the death of Meiko "Menma" Honma (Satoshi's older sister), in a way like not crying.