Single-Minded Stakeout

Single-Minded Stakeout (一途なステイクアウト, Ichizu na Suteikuauto) is the second story of the fourth episode of the anime series Full Metal Panic? Fumoffu.

Summary
Kaname goes on a date with a former classmate to an amusement park while Sousuke and Kyoko follow her. Sousuke seems relieved that she's simply on a date until a drunken yakuza group threatens Kaname. Not wanting to reveal that he was following her, Sousuke comes to the rescue disguised as the amusement park mascot.