While the exact title may not exist, these works share thematic DNA:
The janitor’s room contains a portal, a hidden AI, or a time-slip. The JK is actually a ghost, a time traveler, or an experiment. The “daily life” aspect juxtaposes normal school activities with supernatural events. daily life with a jk in the janitor39s room v1 link
Make a post: “Looking for a VN/web novel – title about a JK and a janitor’s room. Any v1 link or demo?” While the exact title may not exist, these