A T rating would be more fitting for this story, and you have a couple typos. The story isn't very focused or structured, it feels more like recap of a playthrough ("this happened, then this happened, then this happened.") than a story based on one. You need to slow down some and add more descriptions of what is going on around Ayano and her planning her actions in her head. The pacing goes so fast that there isn't any impact, even from the part where Taro catches her. She literally failed at her motivation, it shouldn't not feel like anything. Also, there is no way anyone is going to stop chasing a suspected murderer to give some students detention.

There's a Yandere simulator section now, please post this there instead of in Yandere.