Ikuyoshi Sasaki is a former host who worked alongside Haru Kaidō before quitting the profession after Haru's departure. He then partnered with Haru to establish and operate the "White Fang" cafe. A high school dropout, Ikuyoshi entered hosting driven by strong admiration for Haru. He originates from a large farming family in Chiba, consisting of parents, an older brother managing the family farm, and two older sisters married to farmers. This agricultural connection enables his family to supply fresh vegetables directly to White Fang.

Initially skeptical about befriending Haru's younger adopted brother, Ren Kaidō, citing differing interests, Ikuyoshi later developed a friendly rapport with him, affectionately nicknaming him "Ren Ren." Discovering the romantic relationship between Haru and Ren caused Ikuyoshi significant shock, prompting him to directly question Haru after witnessing a kiss. Haru's nonchalant response questioning the abnormality of their affection gradually led Ikuyoshi to accept and become accustomed to their relationship.

At White Fang, Ikuyoshi manages the food supply sourced from his family's farm. His personality is characterized as friendly and lively, reflecting his supportive role in the cafe's operations and his interactions with both Haru and Ren.