If I were to die, who would you drink tea with? This question, posed by her grandmother long ago, lingers in the mind of Mitsuruko, a refined yet endearingly absent-minded young lady who has come to understand just how lonely a solitary cup of tea can be. The story begins when she opens her Tokyo home to Ritsu, a practical and grounded vocational student newly arrived in the city. What starts as a simple living arrangement born of convenience soon unfolds into a quiet companionship, shaped by shared laughter, small domestic mishaps, and the comforting ritual of afternoon tea.

The narrative follows the daily lives of these two young women as they navigate the unpredictable rhythm of living together. For the orderly Ritsu, life with Mitsuruko is anything but structured, featuring burnt meals, overflowing bathwater, and a general state of delightful chaos. Yet beneath her clumsy charm and absent-mindedness, Mitsuruko reveals a quiet warmth that gradually draws Ritsu in. As they share cups of tea, they begin to fill the empty spaces in each other's lives, and a single shared cup starts to feel like home. The manga explores how the smallest, most fleeting moments can linger the longest, building a bond that moves from mere coexistence to a deeper, more intimate connection.

The series is set in contemporary Tokyo, centering almost entirely on the evolving relationship within the walls of Mitsuruko's home. The key narrative arcs focus on the development of their bond, from an awkward cohabitation to a meaningful partnership. A central thread is the promise Mitsuruko made to her grandmother to find someone to share tea with, a promise that finds its fulfillment in her growing relationship with Ritsu. As the story progresses, it navigates the shift from a practical arrangement to a heartwarming girls love romance, highlighting how daily rituals can transform into profound expressions of care and belonging. Originally self-published as a doujinshi, the manga was later released as a three-volume series by a digital publisher before being licensed for an English release.