宇宙兄弟 (Series) favorite_border

[DeepL Translation - needs review] Volume 1: The year is 2025. My brother believed in himself one more time. The story of his journey to Mars via Tsukuba begins!　A full-fledged space manga about brothers!　In the year 2025, Rokuta and Hibito make a promise to each other while gazing up at the stars. Meanwhile, Rokuta has been fired from his job and is unemployed. A single e-mail from his brother makes him start aiming for space again!

(Translator: DeepL)