Full Metal Panic! Short Stories Volume 7

Former mercenary Sagara Sousuke might just be getting comfortable with his life in Tokyo. After all, most students his age would love to go on a triple date with college girls, attend a drinking party in a house of welcoming foreigners, or take a day off while the school hosts a VIP... but then, things for Sousuke are never quite that easy. Not only does none of that quite go as planned, he also has to save a delinquent double agent from exposure and interrupt a late-night hot pot party to foil robbers at the school! No matter how the days might feel like heaven, Sousuke never fails to find a little slice of hell!

[From J-Novel Club]