Koi. - Itoshii Itoshii to iu Kokoroいとしい いとしい というこころ; Itoshii; Itoshii Itoshii to Iu Kokoro; Koi (SAKURA Roku); Koi - Itoshii Itoshii to Iu Kokoro; 戀。

From AQUA Scans: During the entrance ceremony of high school, while looking at the rainbow after the rain, the main character Haru met, an unusual girl with an aura of 「air」-?