Boku no Suki na Hito ga Suki na Hito

Sora Akizuki, a second-year high school student, gets rejected by his junior and crush, Miya Fuwa, because she is in love with Asahi Suzukaze—the president of the "Clinical Trials Club." To learn more, Sora decides to join the mysterious club. There, he is shocked to discover that Asahi actually has a crush on the "Clinical Trials Prince," a boy who saved her through a clinical trial program when she was sick as a child. Unbeknownst to anyone, the childhood prince Asahi is looking for is actually Sora himself back in elementary school.

(Source: MAL News)