>Itsuki's and my parents passed away 2 years ago.
>They got caught in the incident where the prototype heroes repelled the Vertexes... that is, the "Battle of the Seto Ohashi Bridge Ruins".
>The one who told me of our parents' death was a Taisha messenger.
>I nearly fainted from the shock when I heard the news.
>It... wasn't easy accepting that Mom and Dad had died.
>But I couldn't stay depressed forever.
>Because I needed to protect Itsuki.
>Now that Mom and Dad are gone, I'm all that she has.
>The Taisha messenger told me to become a watchdog for one hero group.
>And in return, Itsuki's and my living expenses would be guaranteed.
>Since I was only in my first year of middle school, I had no means of raising Itsuki on my own, so I had no choice but to accept.
>The Taisha secretly gathers data on all Shikoku girls' aptitude to the hero system.
>My aptitude was apparently high.
>I took hero battle training while forming a group of system compatible girls just as the Taisha directed.
>That was the Hero Club.
>Several groups of compatible girls like it exist.
>Not even the Taisha knew which group would awaken the next time the Vertexes arrived.
>It was by unfortunate chance that we awoken.
>But at the same time, I might have actually been happy about it.
>Because now I can avenge my parents by killing Vertexes.