Chitose is a high school baseball player who had to abandon baseball due to injury.
One day, when Chitose was spending a boring day off without any goal, Chitoses life changed completely with a VRMMO game that was suddenly sent by his sister Haruka! “Oy Onii-chan, lets play a game together in our spare time!”

A high school baseball player became a gamer at the invitation of his cute sister! ? Using his excellent baseball sense to enjoy a fun game in a VR world!