You just moved out from home where your stepmother and stepsister live, into a house where four other females live, including the landlady/caretaker. You also study in a local temple.
As you soon find out, the monk you are learning from is a master of SM training, and you are to become a SM trainer under his guidance. Also, the landlady is the widow to one of the monk's pupil. The husband passed away before he can finish training her, and she has been in depression ever since. Now it fells on your shoulder to finish her training and lead her to happiness. Along the way you will also have the opportunities to interact/train other tenants in the house.

[From Anime Densetsu]