OBA-314 Michika Yagi, the boarding house lady who fascinates us all

I am currently a 2nd grade prep school student. - I tried to pass the exam on my own, but in the end I was unsuccessful and ended up moving to Tokyo and living in a boarding house. - In this boarding house, there is an unspoken rule that only those selected by the manager, Aunt Michika, can participate in the special late-night classes. - The contents of the course are only known to those who have attended, but just imagining the course alone with the huge-breasted Aunt Michika gives me a nosebleed. - However, on her first day at the boarding house, contrary to her imagination, she hears groans coming from the room where the training is being held.