Sachi is an Alternate Universe version of Mint Adenade
She fits with her healing abilities and kind nature, as well as her golden hair. The gang did a "Super Sentai" Stance for Sakura's birthday.
Sakura wanted them to do it because she saw them as her heroes for rescuing her, and it reminded her of the Super Sentai series. Sakura soul was lost in the "spiritual realm".
Given her coma wasn't really natural, it wouldn't be a stretch if she ended up there. The spiritual realm is the Dreamlands
While the Dreamlands isn't the afterlife, it is the place of magic and unusual creatures both wonderful and terrible. The cast is destined to become a Sentai-like superhero group
Looking through the story they have all the makings of the avearge Sentai. The Protagonist is the Leader, Daiki is the The Lancer, Sachi is The Heart, Yurie is The Big Guy due to being the best fighter, Godo is the Smart Guy, and Mamoru is the Sixth Ranger. The party loosely fits the Call of Cthulhu party cast
- The Protagonist is the Face.
- Daiki fits the Investigator, as he has the "Search" ability that allows him to search the enviroment. The only skill he wouldn't have is being able to glean information from books. (Which ironically is called "Investigate" ) He also
- Daichi
- Sachi fits the Scholar, as she is able to find information from Books, and her skills "Biology" and "Occult" imply knowledge in those fields as well.
- Yurie really fits the Fighter, as she is the best fighter amongst the cast, as she has "Martial Arts", Jump, Swim, and Throw skills.
