Thirty-year-old Reina Hirota has settled into a comfortable but stagnant life in Tokyo, spending her days snacking and binge-watching television shows while working a stable job at a library. Her content solitude is shattered when she learns that a time capsule she buried as a child is about to be unearthed, forcing her to confront the gap between her childhood dreams and her current reality as an unmarried woman still living with her parents. This wake-up call prompts Reina to crawl off the couch and begin husband hunting, not only to find love but to help her family find their groove again, though she struggles to figure out what she truly wants in a partner or in life.

Reina dives headfirst into the dating pool, encouraged by financial support from her parents specifically designated for her search for a husband. Her early experiences involve back-to-back dates with multiple men named Yoshio, each encounter more disastrous than the last. When she meets a scruffy single man who checks all her boxes, Reina does something she has not done in a very long time and chases him down to shoot her shot. The connection develops quickly enough that he floats the idea of getting married on a whim.

The romantic complications deepen when a surprise kiss from one of the Yoshios leaves Reina flustered, prompting an intervention from familiar faces from the original Tokyo Tarareba Girls series. As her heart becomes increasingly conflicted, a man named Morita whisks her away to the sea and finally reveals her lifelong dream, making Reina imagine a completely different future involving beachside barbecues. Torn between different prospects, she finds herself trying to decide whether hunk or handsome suits her better, leading her to lock lips with another Yoshio to test for romantic sparks, though the outcome surprises her.

Following an unsatisfying sleepover that leaves her feeling unloved, Reina shifts her attention toward a character known as the Boss in hopes of securing another kiss. When she discovers he cannot stand her personal style, she panders to his tastes and dresses to impress, drawing upon years of romantic comedy marathons to crank up her charisma in an attempt to woo him. The series follows Reina as she navigates these overlapping romantic possibilities while wrestling with the larger question of what she wants from her future, all set against the backdrop of modern Tokyo where thirty-something singles confront societal pressures alongside their own evolving desires.