When company downsizing means either Kotaro or Hideto must lose his job, single Kotaro resigns voluntarily for Hideto’s sake because Hideto has a family and has just bought a home. Hideto and his wife Rinko vow to repay his kindness someday. Six months later, Kotaro, now working on a sightseeing bus back in his hometown, comes to Tokyo on assignment. He lusts after Rinko when she welcomes him and makes a move while Hideto is away. Unable to firmly reject the man to whom they owe so much, Rinko ends up sleeping with him.