Boku wa Subete wo Shitteiru
I've Seen It All·僕はすべてを知っている
Saikawa is a top doctor at his clinic, specializing in treating male genitalia. He regularly assists men with various issues, encountering mostly unattractive penises. Believing no truly beautiful ones remain, he becomes disheartened and wanders until he meets Asano, a cell-phone store clerk with an unexpectedly attractive appearance.