The Rain, the Umbrella, the Rainbow

In a one normal rainy afternoon as Amemiya was about to go home, he found his crush, Nijima Koharu alone, waiting for the rain to pass. He was unsure if he should offer to share his umbrella or just outright give it to her, but when their eyes met, his mind went blank. "I-if you don't mind, w-we can share this umbrella."

Note: It is a short story consisting of 7 chapters.