Satomi Wanatabe is a meticulous university student in Kyoto determined to conduct the ultimate “ relationship experiment”: date the charming, enigmatic architecture student Ren Takahashi for thirty days while maintaining strict emotional boundaries. Professional, controlled, and logical, Satomi expects to study love like a subject in her notebook.
Ren, calm, clever and effortlessly charming, agrees to the arrangement—but his more unpredictable than Satomi anticipated. From latte spills and goldfish fiascos to pigeon invasions and riverboat mishaps, their thirty days together are a whirlwind of comedy, chaos.

As petals drift along the Kamogawa River and festivals light up the city Satomi that love doesn’t follow rules— and neither does Ren. Between playful banter, awkward accidents, and quiet confessions beneath cherry blossoms trees, the thirty days experiment begins to unravel. Feelings emerge where none were meant to, jealousy flares unexpectedly.