Full Metal Panic! Short Stories Volume 1 — Shouji Gatou

Sagara Sousuke is your average Japanese high school student. He gets love letters in his shoe cubby -- which he mistakes for bombs. He helps out the student council -- by interrogating suspected vandals. He even models for art class -- by engaging in guerrilla combat! The presence of the war-addled military geek drives Chidori Kaname crazy, but she can't deny that he makes life exciting. Even after he booby traps their beach supplies and agrees to date another girl (merely to gain “field experience” of course), she just can't leave this lone wolf alone!