A "letter film" in the form of a monologue addressed to Mayu, the eldest daughter of a cousin. Dear Mayu. I was very happy to see you after a long time. And then the filmmaker begins to talk about her own experience. Two years ago, when I had a lump in my breast, I went for a cancer check-up. Two years ago, when I had a lump in my breast, I went for a cancer check-up, which was the first time I saw my vagina and womb. The screen inserting Mayu's image playing by the river into the artist's image during the examination expresses the anxiety and loneliness of growing up and the awareness of one's own sexuality that lies ahead. The anxiety that Mayu feels now is something that the author herself felt in the past.