The cause is an ancient legend.
The process is to defeat monsters and upgrade. The male and female protagonists had an irreconcilable misunderstanding at the beginning, and then the misunderstanding gradually deepened as they got along?
The heroine is a bit timid, but she is definitely not weak. She will take up arms to protect herself when necessary.
The male protagonist has an ego-type personality and always takes up arms to attack others psychologically or physically when it is not necessary...
Purpose: Fight monsters, upgrade and grow yourself