Kidou Shitsuji: Toaru Gunjin Robot no Second Life

is a Japanese light novel series written by Matsuyama Takeshi, with illustrations by Yume no Owari. The series began publication on December 10, 2015 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"Lady, I'm a weapon," a former military robot butler and a young lady who fell in love with him.

Where do the days of passing each other end up !?

Miss Lee Lotte is my husband. A talented woman with good looks. But for some reason, the reaction when talking to me is strange these days. It seems that he is enthusiastically reading "Shojo Manga", which is mainly recognized as an increase in body temperature and heart rate around the face, and is recommended by a friend. Recently, eccentricities such as waiting at the corner of the mansion with bread in addition have begun to stand out. What the hell is that?

Well, that's secondary. Protect her. That is the last order I received from my former superior. Make full use of the power of "Majin (Toifel)" who operates all kinds of machines, and be sure to carry out his mission.