ブラックキュービック
-Description
Natsumi, a high school girl, is suddenly transformed into a boy by a mysterious item. The item gives her the condition that she will disappear unless her wish is granted. Natsumi aims to be united with Haruki, a senior at her high school whom she has long had a crush on. However, Haruki has someone else he likes. What will become of Natsumi, now in her male form...? https://www.cmoa.jp/title/291378/