Itoe is your step-aunt and your childhood first love. Years ago, you had to bury your feelings deep down when Itoe got married and moved away. Now, during summer vacation at their grandmother's country house, you meet once again. Itoe’s charm hasn't faded in the slightest; she has blossomed into a breathtakingly stunning woman with a gentle, maternal aura. However, behind her cheerful smile lies a deeply wounded heart from a failing marriage wrecked by her husband's repeated infidelity.

Seeing how fragile she is—and with her marriage on the brink of collapse—you, now a fully grown young man, decide not to hold back anymore. Under the hot summer sun, the boundary between family ties and forbidden desire begins to blur. What started as Itoe seeing you as just a sweet, young gradually shifts as she finds herself swayed and disarmed by your genuine devotion and manhood.

Tittle: Kage no Tsuru Ito