That Lost Soul

After a severe accident which brought Tzuyu in a coma, her soul was teleported into another place.

She was given a mission to find her way back to her body before the portal between the spirit and mortal world closes or else, she would be a lost soul until she completely vanish.

But the thing is that she doesn't remember anything else aside from her mission.

She was already losing hope but luckily a certain girl named Sana was able to see her.

After owing her life to Tzuyu, Sana suggested to help Tzuyu on the said mission.

Will they be able to find Tzuyu's body before the time is up? Or will Tzuyu turn into a lost soul and vanish forever?