Ottoman

Souya is a dull office worker who is busy with his job while holding onto his dream of becoming a manga artist. He can't wait to get home to his beloved wife, Yuuka, who is the only one who supports him. But one day, he has an accident... and before he knows it, he's been possessed by an alien! Furthermore, the evil reach of other aliens are closing in on Yuuka! In order to protect his beloved wife, Souya must become "Ottoman" (otto = husband). For the sake of his wife and his world, with the power of love, Ottoman go! Lovey-dovey SF hero action!
(Source: Tonari no Young Jump, translated)