Densou Genshi Mirukyua

Natsuki's older sister is really into an online game called "Real Breaker" but she can't play it for a while because she has to go on a business trip. The problem is, a super rare item called the "Mirage Stone" that can grant any wish is going to be released while she's gone, so she makes Natsuki play it for her (with a female character) and...