Bocchi no Boku ni Kyousei Kanojo ga Yattekita is a Manga/Manhwa/Manhua in english language, ROMANCE series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

On my 24th birthday, I came home to find a woman who wanted to be my girlfriend! As a "loner" since junior high school, I was confused by all this. But the truth is she is my mother's junior at work, and my mother asked me to!? A pseudo-romance between two people with the same interests has begun!