Didn't I say to make my abilities average in the next life

Mile is a super normal 12 year old girl! Or so it seems... She's actually one of those reincarnated-into-another-world people that are all the rage right now, who has all her memories of her past life as a Japanese high school girl named Kurihara Misato! Lots of stuff happened and Mile decided to become a Hunter, so she's arrived in the Kingdom of Tiers where she learns of a series of child kidnappings in the capitol. Being a good person, Mile looks into the incident, but...

After successfully(?) concluding the incident, Mile enters the Kingdom of Tils' Hunter Prep School where she reunites with the three girls she met while investigating - Reina, Mavis, Pauline - and ends up forming a party with them. The experiences from her previous life make Mile dream of average happiness, but the three girls are very curious about the cheat-level power she just can't seem to keep hidden. Will Mile's dream ever come true?

It's been six months since they started at the Hunter Prep School. Drawn along by Mile's insane abilities, Reina and the others' skills have rapidly improved so that they've mega leveled up without noticing. But just before graduation, Mile is pulled into a sordid plot. In order to protect the Hunter Prep School and keep it from getting closed down, Mile and the others must take on the challenge of the "Graduation Certification Mock Battle." It's a fight they can't afford to lose!

Now full-fledged Hunters, Mile, Reina, Mavis and Pauline form the "Crimson Vow." That said, they're still just novices, so they work some questionable side-jobs while steadily gaining experience through straight-foward quests. One day, while on a quest as guards, they are attacked by bandits. The bandits think they'll have an easy time of things, but Reina's acting strangely...

Reina reveals her past... Memories of a tragedy that torments her still. Then Pauline reveals her past, and Mavis reveals hers too. Then, suddenly, Mile gives confirmation of her past as well. Up until now, she's managed to gloss things over, but the truth of her reincarnation into another world is here! And, of course, "those girls" will make an appearance too!

Now that they each know the burdens of each other's pasts, the Crimson Vow has only grown closer. Their job guarding has come to a successful close and they have a moment to enjoy a brief rest, but sudden bad news brings the smoldering embers of Reina's resentment roaring back to life. How will Mile and the others face this first threat to the Crimson Vow? Their friendship is about to be tested...