
Why she assuming the saviour is Japanese though

Is true that there's a large population of Japanese (or descendants of Japanese) in South America with Japanese names (like Peru's Keiko Fujimori). However, with these isekai stories the authors always name it so that the MC and all isekai'd people are from the same nationality as the author. They don't really go for diversity. I get it though. It's safer to just write from a Japanese point of view so you dont get anything wrong.

A forbidden relationship between spirit and human / contractor and contracted.
A hot passionate love that grows ever so more stronger that they soon want to become one only to be put against barriers as their bodies repell since biologically their bodies dont accept each other.
But together they fight against adversaries with the power of love.
I'm bored
I feel bad for him thinking she likes him