Tatsuyuki Oyamato the 4th

Completely disarmed by Minori, gang leader Tatsuyuki Oyamato is sent down to Fukuoka to expand the family's territory in Kyushu, with the hidden intention of revitalizing himself. However, after arriving in Fukuoka, the dismayed Tatsuyuki is still distraught. Completely drunk and lying in a park, he's taken home by someone and treated to an evening of his wildest desires.

(Source: Renta!)