A certain boy and girl in middle school became a couple, flirted with each other, disagreed on trivial things, became more frequently irritated with each other… and eventually broke up upon graduation.... more>>

Now in highschool, the two of them, Irido Mizuto and Ayai Yume, wound up meeting each other in the most unexpected fashion.

The former couple, brought together through parental remarriage, decided to be mindful of their parents’ feelings and came up with a ‘sibling rule’—where the first one to become conscious of the other as a member of the other s*x loses, but…

When they encounter each other in the bathroom, commute to and from school together, along with the memories of the past and living under the same roof, just how do they disregard each other!? <<less

Five years since I graduated from high school, and within those years, at the same time I was confined by my younger sister, but it all ended when I ran away and died being hit by a truck. At last I’m free from my devil-like sister! Well, that’s what I thought but my sister was reincarnated with me at the same time in the same world. But this time, I’ll escape from my sister’s clutches and live my life in a different world freely. With the strongest weapon and class I received from god.... more>>

Geez onii-san, cheating on me is unforgivable you know~ <<less