There is a magical island on the continent of Nafi Saint Ryder - Mipros.
It is a place where past and present intersect, and where the future can be seen.
The locals gave it a nickname, the Promised Island.
Xia Wei, a girl who wants to live an ordinary life, possesses naturally powerful magic power, so a seemingly ordinary trip to a hot spring becomes an important "test" in her life journey.
Why did the ancient sage and the god of dreams entrust her with the task?
How can the girl who has been put in high demand turn the tide and complete this series of dangerous tasks?
When it was all over, what she got paid was...?
(Semi-original story, the plot is adapted from the anime and its derivative, The Party Detour 233333)