Circle of Saviors is a new PC VR game which is under development at the moment. But in the past few months you could try it in different events and now you can do it again if you visit the Aeon Lake Town store in the Saitama Prefecture.
One play time costs 500 Yen (with tax) but if you pay for two times you have to pay 800 Yen (with tax). So if you are interested in the game visit the shop. The deadline is not published.