Michika and the Star Poem

Kaisei spends his days feeling isolated at his high school in the city. At his mother's suggestion, he decides to go stay at his grandmother's house in the countryside for the summer.

There, at the traditional candy store called "Makemake" that his grandmother runs, a mysterious regular customer named Akira shows up—and claims to be an alien...

Source: Ohzora Shuppan, Vol. 1, MTL