Ranran wants to marry him now, but her boyfriend is reluctant to marry her. You should be able to get married if you get pregnant! I try to do this, but there is no sign that it will work. At that time, he noticed that his girlfriend's older sister had given birth many times in the few years they had been married. Her older sister remarried and was unable to become pregnant with her previous husband. However, since she married her current husband, she has given birth many times. ``Let's have my girlfriend's brother-in-law cum a lot'' The devilish pregnancy journey begins...