In middle school.

Rui is introverted and always eating his lunch or spending his free time on the rooftop, he doesn't have friends (obviously)

At the rooftop, As he was looking at the view, he suddenly heard the door creaking open

"..."

He looked behind him and then he saw Tsukasa Tenma. The most popular, super kind and energetic boy at this school but Rui didn't know him yet.

"Who are you..?" He said confusedly but he was blushing at how Tsukasa looked even though they just met