Oh, My Sweet Alien!(2009)

Yome ga Kore na Monde.

Nobuo is an ordinary salaryman with a dark secret--his wife is an alien! Despite her tentacled hair and tendency to shoot beams from her eyes, he wouldn't trade her for anything. Love knows no bounds in this extraterrestrial romantic comedy!

(Source: Yen Press)

Notes:
- The chapter count includes 2 Bonus Stories