This is a parody of the .hack-series with appearance of the characters from SIGN, Udeden and the games:
As a thank you to the players of the .hack games, Helba has prepared a special hot springs for some much needed rest and relaxation. Tsukasa, Mimiru, BlackRose, Kite and the other important players of The World decide they`re due for some soaking in the springs themselves. There`s a catch, however: not only will Helba not reveal its exact location, but she insists that role-playing is forbidden. So who will find it first? And who keeps killing the other characters?


Notes:
- It is also referred to as "Episode 29" of .hack//SIGN.
- This OVA was originally a giveaway in Japan for those who bought all 4 .hack-games and will probably be included in the US-release of .hack//Quarantine.