Repent Loci - Useless Apologies of a Troublesome Witch

This game is part of the Repent Loci series.
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Synopsis
A bunch of high school students are stranded at school, waiting for the end of a school day plagued with absent teachers.
One of the students, a lonely girl with an eerie behavior, is called a witch and inspires worry to all but one male student, the player, who seems to disagree and routinely volunteers to interact with the witch.
Far from subsiding, though, the situation gets eerier as strange markings appear on the blackboards, and the witch starts causing floods on purpose; never stopping, but always apologizing for it.
The situation reaches its peak when the male student wakes up at dawn, still at school, and surrounded with way worse than chalk oddities and vain apologies.
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Contents
The game is divided into 2 chapters:
The first chapter is set during the daytime, and focuses on storytelling. It mixes wandering around and VN-like dialogue, as the situation builds up.