My big-breasted senpai Nene, a face I've known for a long time and admired, married my older brother, who is in the same grade as me, and became my sister-in-law. As you can see from her jiggling I-Cup breasts, my sister-in-law loves sex and is proactive enough to invite me out at night, but my brother is sloppy, so my sister-in-law seems to be getting more and more frustrated... One day, my sister-in-law invites the manager of the izakaya where she works part-time to her house during the day...