Yui Sakurai, who is active as a member of the idol group FRUITS ZIPPER, made her solo major debut with the song "Kimi no Koto ga Suki na Watashi ga Suki" from Universal Music in September 2025, and now releases her first CD single since her major debut. The title track "Natsu Izon" is a new-style summer song themed around "Reiwa summer love." It depicts the fresh feelings of enjoying a first summer spent with someone of interest, including modern ways of spending summer in the Reiwa era such as indoor dates and evening walks. The lyrics realistically convey the excitement of realizing that you may like the other person, paired with a pop melody that colors those feelings happily, making it a Reiwa-era summer love song. The second track "Hikari" is featured as the ending theme for the TV anime "Love Unseen Beneath the Clear Night Sky." starting on July 6. It is a pure and straightforward love song about the importance of facing others and the joy of having someone who responds, and the desire to return those feelings. The third track is her memorable solo major debut song "Kimi no Koto ga Suki na Watashi ga Suki," a positive love song about coming to love yourself through loving someone who also comes to love you. "Nigate Osoroi," included only in the Limited Edition Type A and Type B, is a slightly unique love song about the bond between two people, depicting a heartfelt moment where sharing small dislikes strengthens the certainty of love. The Limited Edition Type B comes with a slipcase, a DVD (one disc), a lyric book (8 pages), and one selfie photo card (Costume B ver. / randomly selected from five kinds).