Yōhei Hozumi, a Tokyo native, relocates to rural Shizuoka to help his uncle manage a music studio in Shizoku. Soon after arriving, he crosses paths with a local band renting studio space and becomes entwined in their creative pursuits. The group grapples with securing a stable vocalist, pushing Yōhei to collaborate closely with members Ayana Saeki and Mika Katagiri—students at Kotohira Gakuen—with his approach to their dilemmas shifting based on player-guided decisions.

His family life includes a younger sister, Eri Hozumi, who divides her time between piano practice, drama marathons, and playful curiosity about his love life. He also reconnects with his cousin Chiaki Shinjyou, a composed former vocalist-guitarist from a dissolved light music club, now aiding at Shinjyou Studio with quiet maturity.

In Shizoku, Yōhei navigates relationships with an eclectic cast: Megumi Chigasaki, a sharp-tongued homeless woman inhabiting a derelict ship, and Mai Hoshino, a school-focused character restricted to non-adult storylines. Player choices dictate whether he mends tensions with Megumi, navigates Mai’s academic involvements, or bridges gaps within the band.

The narrative branches through Yōhei’s decisions, shaping resolutions to the vocalist crisis and interpersonal dynamics. His journey balances studio duties, deepening bonds, and steering the band through creative hurdles, with no documented expansions into spin-offs or alternate media beyond the core game and its iterations.