A Cat and a Kitten's Rock & Roll

A Cat And A Kitten's Rock & Roll ((猫と子猫のR&R(ロックンロール), Neko to Koneko no R & R (Rokkunrōru)) is the thirteenth episode of the anime series, Full Metal Panic!
== Summary ==
During a heated argument with Melissa, Tessa challenges her to an AS duel. However, Tessa realizes that she may be in over her head and asks Sousuke to be her AS coach.