甘く切なく擬（もど）かしい、ふたりの長い夏の前日。――日吉ヶ丘（ひよしがおか）芸術大学4年生・青木哲生（あおき・てつお）。月下（げっか）画廊店長で、和服が似合う大人の女性・藍沢晶（あいざわ・あきら）。突き動かされるように体を繋げた一夜から、激しくも拙い恋愛が始まる――。 『恋風』『水の色 銀の月』以来待望の吉田基巳最新作!! 美大生・青木哲生、和服の似合う年上の美女に身も心も耽溺する!! Tetsuo Aoki is a 4th year oil painter at a fine arts school. While working in an art supplies store, he meets an older woman named Akira Aizawa, who is the owner of an art gallery. Aizawa becomes interested in Aoki and she begins to pursue him when she catches him painting on the riverside. After such, their relationship begins to develop romantically. Will it develop smoothly? Or will there be unforeseen events?