Keiken wo Sukiru ni suru Bannou na Nouryoku wo Te ni Irete, Saikyou no Tansaku-sha ni Narimashita ~JK to Issho ni Dungeon Tansaku de Nariagaru~ - Vol…

[MangaDex]

 

[FloorRoof]

That's a familiar artist.

 

[w4nzxtxgrgn]

a sports bra would be more helpful than that half breastplate thing...

 

[Ithi]

a sports bra would be more helpful than that half breastplate thing...

It would work fine if she was using a large shield and fought in a formation like phalanx, still the armor should've been over the other breast even in that case, since she is right handed.