[Reducing Mosaic]DASS-390 If you're going to graduate from being a virgin, it's got to be with two people at the same time, right? We've been best friends since we were kids, so during the week when our parents are away, we'll have a threesome with internal ejaculation. Y

Whether it's now or in the past, these three have always been close. However, Tomoki and Koichi start to strongly notice Rimu as a member of the opposite sex. Rimu also sees them as such, and since she doesn't have parents, she invites them over to play. As for Tomoki and Koichi, there's an unspoken agreement not to make a move on Rimu first. However, Rimu is very interested in sexual things and feels frustrated that she can't get Tomoki and the others to make a move on her.