Spy x Family by Tatsuya Endo
Master spy Twilight is the best at what he does when it comes to going undercover on dangerous missions in the name of a better world. But when he receives the ultimate impossible assignment--get married and have a kid--he may finally be in over his head! Not one to depend on others, Twilight has his work cut out for him procuring both a wife and a child for his mission to infiltrate an elite private school. What he doesn't know is that the wife he's chosen is an assassin and the child he's adopted is a telepath! Read a sample.