(a sans au story) Highschool murder case

Hiya! this is my first fanfiction so enjoy reading!!!

It was so far a regular year for ink in high school and was also a good year! He had friends, good grades, anything he could ask for. But when four new students show up, something changes. something is just off to Ink about the four. One Saturday morning, Ink sees a murder case on the news, when he sees who the skeleton killed was, he almost has a heart attack. Determined to find the person responsible for the murder, Ink and a few friends set off, they question people, do research, and even eavesdrop on a few conversations. But to find the person guilty, he'll have to know more than who was there and what weapon was used.

What Ink doesn't know is that some people at his school are not who they say they are. To find the murderer, he'll have to know who these students are and what is different about them.