Yon-bun no Ichi no Kizuna SP (2004)

Yon-bun no Ichi no Kizuna SP 2004 / 四分の一の絆 2004 /

Naoya's pregnant mother kills his dad because he was an abusive drunk. Naoya works in a car shop and lives with his two childhood friends, Shota and Maiko. He doesn't know about his little sister. She is adopted by the cop's family. Eight years later, his little sister becomes really sick and needs a bone marrow transplantation, or she'd die.