Tatsuno Miyoshi (born 1971) was a Japanese student who went to high school in Kabukicho, Tokyo during the 1980s. On 14 December 1988, he got into an argument with his girlfriend Mina Fukuhara after coming to suspect her of prostituting herself, having found ¥200,000 in her purse, and become suspicious after she made herself too busy to date him. He persuaded Kazuma Kiryu to investigate on his behalf, and he found that Fukuhara was, instead, selling her underwear for money. She later admitted to Miyoshi directly about the truth; he thanked Fukuhara for her honesty. They both ran to confront Sachiko Kojima and attempted to persuade her to let Fukuhara leave the business. Fortunately, Kiryu convinced Kojima to disband the group, and Fukuhara was then freed from her lewd side business.