I may be overreacting if I would say that this is one of the most beautiful and funniest manga I've ever read.

The story takes longer than other mangas, but this what makes it the most beautiful. You will see the struggles of both brothers, and the other characters. It's very inspiring, in a way that it is light, you can read it anytime or best to read it in public because you will be captivated in the story and people surrounding you will not matter (tried it several times.) You will be absorbed and laughed in the story. Also, the decisions that each characters do are very realistic and if I were to put myself in their shoes, I will do the same. Aliens do not need to be in the story because it's already adventurous!!!

Koyama-san really brought me in the moon. And I'm looking forward to more space adventures.