Share House no Koibito

In an attempt to change her life, Tsuyama Shio, a 30-year-old plain-looking office lady at a conservative company, makes up her mind to get started by living in a shared house. Through a strange turn of events she meets two intriguing men and falls in love for the first time in a long while with one of them, Sakurai Yukiya.
Sakurai is a salaryman in his 40s, has a wife and child but his life has ceased to matter because of something and he abandons work as well as family to come to the shared house. However, Sakurai is gradually drawn to the simple, gawky and mysterious Kawaki Tatsuhei, an alien being from outer space who came to the house attracted to Shio. And so a curious love triangle begins.
(Source: Jdrama Weblog)