Mari Ashida and Eri Ashida, twin sisters, appear at the pure age of 18. Both have never even kissed before, sharing a special bond by experiencing everything for the first time together. Having been together since birth, they take each other for granted yet grow closer through these first-time experiences. Cherishing their private moments together, they carefully nurture their first love and physical relationship, exploring their feelings for one another. A touching story filled with sweet and bittersweet lesbian chemistry, conveying innocence and warmth.