Taiga, an employee at a publishing company, finds himself living with his high school friend Shu, who becomes his brother-in-law after Taiga's sister's sudden marriage and subsequent disappearance. Forced to take care of his younger siblings, Taiga and Shu navigate their new life together, facing challenges that unexpectedly strengthen their bond. Amidst the chaos, Taiga grapples with resurfacing emotions from the past, culminating in a tender love story.