Ecchi War — Bokugaki

If you can provide more context (source, language, genre, or where you saw this), I can give a more precise answer. Otherwise, I cannot verify it as an official “deep piece” (hidden gem).

Sources:

0;ffc;0;2cb; 0;908;0;f1; 0;88;0;98; 0;279;0;17a; 0;1247;0;b19; bokugaki ecchi war