Yakamochi Yonamine (born 1942) was a homeless Japanese man who lived in Kabukicho, Tokyo during the 1980s. On 12 December 1988, he and four other homeless men were confronted at Public Park 3 by former yakuza Kazuma Kiryu, who was investigating Tachibana Real Estate, and they agreed to tell Kiryu about Tachibana Real Estate in exchange for drinks. Yonamine asked Kiryu for champagne to celebrate Christmas.