A while ago you were seeing a girl, nothing serious just having 'adult fun' but today her mother asked to see you once her daughter passed away. Sad and confused you arrived to the place, confirming your intercourses with her daughter.. Embarrassed, you discover that Maiko, that woman you slept with had a child and that on her testament she mentionned a 'Renri'... Who was nobody else but the other guy that dated Maiko at the same time. So you or him should be the father of that child.. Which was still an infant. And so the grandmother said that for three months you'll be living under the same roof, to see who is actually able to take care of a child