Tamba and Utagawa have been lovers for over ten years, yet their relationship is anything but stagnant. Now both in their late twenties, the couple continues to find new reasons to fall for each other. Utagawa, who often goes by Uta, still cannot believe he has landed such an attractive and reliable partner, while Tamba finds himself completely captivated whenever his usually pure and young-at-heart boyfriend unexpectedly shifts into a more mature and serious mode. The narrative follows the nonstop whirlpool of everyday moments, teasing, and mutual admiration that keeps their hearts skipping beats.

The story is defined by its unique reverse-chronological structure, beginning in the present when the two are twenty-seven and on the verge of moving in together before drifting backwards to explore key moments from their shared history. Each major time period receives its own chapter, allowing readers to witness the evolution of their bond from their first meeting in high school, through their fumbling days as college students learning to navigate physical intimacy, to the comfortable yet still passionate dynamic of their adult life. This structure creates a compelling sense of dramatic irony, as readers see the couple in the present look back at old yearbook photos and marvel at how obviously in love they were long before either one was consciously aware of it.

Tamba is characterized as a studious and seemingly composed individual who is frequently caught off guard by the charming gap in his boyfriend’s personality. Utagawa, in contrast, is more youthful and innocent in demeanor, yet possesses an adult mode that completely floors his partner. Beyond the central pair, the narrative includes interactions with Utagawa’s youngest sister, who provides comic relief as an observer of the couple’s antics. The story is less about overcoming external obstacles and more about the quiet joy of long-term compatibility, examining how two people who know each other inside and out can still surprise each other.

As a sweet romantic comedy originally serialized on social media, the narrative is composed of many shorter vignettes rather than a single continuous plot, which gives it a light and easily digestible feel. Key arcs include the couple deciding to cohabitate, the retrospective discovery of their high school feelings through old photographs, and the flashback to their initial, more awkward attempts at romance and sex as college students. The central conflict is internal and emotional, focusing on the persistent disbelief each partner feels at being loved by the other and the continuous process of re-discovering desire within a stable, long-term relationship.