Yamada Tarō Monogatari. Volume 1

Tarō Yamada is smart, athletic, and very handsome. He seems perfect on the outside, but he's actually dirt poor due to his mother's reckless spending habits and his always-gone father. Although never once does he admit it, everyone at school thinks he is a very humble rich boy because of his good looks. However, at home, he must care for his six younger siblings, who share a one-bedroom place with him and his mother.