Good news - Robamimi is still active and creating in Unity! This escape game is a remake of her old game from 2009 - must be one of the first games she created and wasn't published on JIG then. Important notice: default setting is in Japanese and you can change it on the start screen in the upper left corner. Enjoy!
You find yourself locked in a café but it's not an omission or a mistake; it's a trial. Everything is explained right at the beginning (and that's why is recommended to switch to English) - you work in this café for five years and there's a chance to promote if you pass the trial. The owner left you a letter and explained that your final goal is to find the store manager badge with your name on it.
The careful exploration of the place is essential and on your way you get familiar with the arrangement of the bar, the office and the storage. It comes handy later when you become the manager. Of course, first you need to figure out the code opening 'staff only' door and get to the cafe background - and then get to the office and so on. Don't give up and remember that the badge with your name is already done. Good luck!