Unexpected Surprise (YANDERE SIMULATOR FANFICTION: OC X MALE RIVALS)

Aya Aishi, the youngest sister of the well-known Aishi twins, is more like their father (while of course, the twins are more like their mother). This leads her to be more expressional than her older siblings, and understand the idea of interacting with others even when there's no purpose. She may not be a yandere, but their mother trained her to defend herself, just as knowing the basics of adequately hiding the evidence, how to befriend and make safe deals with others, and much more. The twins can't express it but they treasure their sister since Aya can understand their situation, it's not easy to find the one in order to have emotions.
Then comes the day of the pass or deny day, whether or not the Aishi siblings get accepted to Akademi Academy, a school that's been well-known throughout Japan due to being owned by Saikou Corp. Aya has a strange feeling that this can change her life, and it might be for good or for the worst.

{Author's note: Hey there! I used Picrew to create my OC, to demonstrate to everyone what I believed the youngest might look like (based on what I can see in the Yandere Simulator Info about the characters). For the cover, in Picrew, I used 'Tokotoko Kingdom', which is amazing (sadly, I don't know the artist's name).}