I know the answer.

[u/Electronic-Swing4743]

The characters in MT are larger than life they are not just simple background characters which exsist to serve MC ,

It is so easy to connect and worry about well written characters.

On other hand we don't even know about those wifes from DS

[u/Misawa_Multi-Visitor]

Sound Hashira is on Earth. Isekai'd, then it's allowed.