"Baka and Test - Summon the Beasts 2" continues the comedic and competitive narrative of Fumizuki Academy, a school where students are divided into classes based on academic performance, with Class A being the highest and Class F the lowest. The series follows the ongoing efforts of Class F, led by the academically inept but determined Akihisa Yoshii, to challenge the higher-ranked classes using a unique system where students summon avatars, or "Summoned Beasts," to battle. These avatars' strength is directly tied to the students' test scores, putting Class F at a significant disadvantage.

The second season builds on the established dynamics of the first, with Akihisa and his friends—including the intelligent but socially awkward Yuuji Sakamoto, the tsundere Hideyoshi Kinoshita, and the stoic Minami Shimada—continuing their quest to improve their academic standing and defeat the higher classes. The series introduces new challenges, such as the arrival of foreign exchange students who bring their own competitive edge and complicate the existing rivalries. The narrative also delves deeper into the personal relationships and backstories of the characters, adding emotional depth to the comedic and action-packed battles.

Key plot points include the introduction of a new summoning system upgrade, which allows for more strategic and intense battles, and the exploration of romantic subplots, particularly between Akihisa and Minami, as well as Yuuji and his childhood friend, Mizuki Himeji. The series maintains its balance of humor, school life antics, and occasional heartfelt moments, while escalating the stakes of the class wars. The characters' growth and interactions remain central, with their camaraderie and determination driving the story forward amidst the absurdity of the summoning battles and the rigid academic hierarchy of Fumizuki Academy.