Sister Ria Sakurai naive

The movie is about Ria Sakurai, a beautiful cute girl who likes to play ping pong, so she participates in a ball club. Here she knew a young man because she was so beautiful that the man intended to rape her. In order to accomplish this, the other man asked two other people to work with him. That day the other man called her and she did not expect there were 3 waiting names ... What would be like when her mummy-shaped body was attacked by 3 other names