Himitsu no Otsukiai wo Shiteimasu.
ひみつのお付き合いをしています。
Takase, a second-year high school student, is in a secret relationship with Togawa, a popular classmate. While they appear composed around friends, Takase feels excited about Togawa, who acts more affectionate in private. Their secret is discovered by Kurono, a third-year student who becomes interested in Takase. The story follows the couple's private dynamic and Kurono's growing interest.