Ai wa Kagi no Kazu Dake
Title: Ai wa Kagi no Kazu Dake
Synonyms: Love is the Number of Keys
Aired: May 25, 2002
Jyun is on his own for the first time as his father has gone overseas for a new job. He stays behind because of schooling and moves into an appartment complex as assistant manager only to discover the place is a sex service appartment.