Sundome!! Milky Way manga volume 3 features story and art by Kazuki Funatsu.

Yoshitake has ditched Lune—the universe’s sexiest alien who came to Earth for his seed—to date his innocent co-worker Yuizono Haruka. Another co-worker, Mika, is hot (and hotheaded) with secrets of her own, finds herself trapped in a gym locker with Yoshitake where it’s getting more cramped by the moment. Lune’s entire species is doomed to extinction! It’s a hard time to be hard up!