Benriya Saitou-san, Isekai ni Iku - Vol. 5 Ch. 128 - Binding of the Incubus

[MangaDex]

 

[AnotherDuck]

That's not quite her armour, but very similar.

 

[AzraelPrimal]

Incubus slayer is here

 

[CyanHide]

Gee, I wonder what color that armor is?