After hearing that his grandfather, Souichi Kaga, has died, Daikichi Kawachi and his relatives gather at Souichi's home for the funeral. There, he meets a young girl named Rin, who is allegedly Souichi's illegitimate daughter. Following the funeral, the relatives refuse to take in the girl and opt to put her up for adoption. Daikichi, disgusted with their attitudes, decides to take Rin into his care.