"Time. Space. Reality. It's more than a linear path. It's a prism of endless possibility. Where a single choice can branch out into infinite realities, creating alternate worlds from the ones you know. Each a reflection of what could have been. Some heroes will rise, others will fall. And nothing will be the same. I am the Watcher. I am your guide through these vast new realities. Follow me and dare to face the unknown, and ponder the question... What if?"
―The Watcher
In this reality, the wife is okay with a threesome with her sister and husband.In another metaverse, Haru would be happy and not traumatized. (Little sis won his heart first and no NTR BTW)
Not to mention Kuru's father.We still have yet to see Kuru and imouto's brother? and the hubby's sister that was mentioned in ch.15
aside from Kuru and imouto's mother (Haru's granny on Kuru's side)
plus the other series' Hina, her childhood/hubby, and their daughter Kinako