Please forgive me... labyrinth of lust

Shizuka happens to be present when her neighbor Okamura's wife is leaving. Shizuka tries to cheer up the depressed Okamura, but suddenly his lips are snatched away. Afterwards, Shizuka visits Okamura to greet him about his move and sympathizes with the depressed Okamura, and ends up having a relationship with him...