I randomly saw an update on my usual manga site and gave it a shot. I finished all the chapters in 45 minutes, I enjoyed each one. In a nutshell, two ninjas from opposing sides live together like a modern Romeo and Juliet theme. Who would have thought secret killer ninjas could be capable of love...funny for sure. Though it ended quite suddenly, it seems it lost in terms of popularity and interest against isekai. That's the whole story, the male MC who has been in modern society longer is teaching the girl about the outside world and growing with her. It's a good balance of romance, action, andcomedy while not coming off as unrelated to modern times.