Direct Answer
The current community route for the KOTAMON Jenny's House secret room starts outside Jenny's House, near the white door and beer vending area. Community guides describe using a beer pickup/drink movement setup to clip or push into the house, then checking the interior route carefully. This is not an official quest step, so treat it as a community-reported route that can change with patches.
Secret Location
The reported secret location is inside Jenny's House / office, behind the normally closed white-door area. Use this page when searching for "kotamon secret", "Jenny secret room" or "how to enter Jenny's house" answers, but keep completion claims separate from the route itself.
Current Community Route
Community writeups commonly describe buying a beer from the vending machine near Jenny's House, picking it up, standing by the white door, looking down and pressing Q to drink while positioned against the entry. Some reports also mention roof or collision-edge access. Use only on a backed-up save and record the patch date before relying on the route.
What Is Officially Confirmed
Official sources confirm the game loop, achievements and August 21, 22 and 27 patch context used elsewhere on this wiki. No reviewed official Steam announcement currently says Jenny's House entry is a formal objective, secret-room quest, card unlock or achievement requirement.
What Is Community-Reported
The house-entry method, roof-access notes, possible interior objects and secret-card claims are community-reported. Do not treat a claimed reward as confirmed unless it has current-build screenshots, a patch date and repeatable steps from more than one reliable source.
Patch Caveat
The latest confirmed official Steam announcement used by this wiki is September 1. It covers Steam Community Items, the ongoing startup bug investigation and a planned free update, but it does not say Jenny's House entry is fixed, removed, promoted or part of a formal objective.
Stuck or Exit Safety
Before testing, finish a normal save cycle, export tracker progress and avoid carrying valuable loose items into the movement attempt. If the camera, collision or door state behaves strangely, quit without overwriting a good state and restore from the last safe save if needed.