Full Metal Panic! Short Stories Volume 7: Untenable Seventh Heaven Feeling? by Shouji Gatou

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!