The anime's first season focuses on Tenma, Harima, and Karasuma, and Harima's relationships with other females including Sawachika and Yakumo. Its second season involves more of the secondary cast. The "Extra Class" OVAs are compiled from various first season storylines. Both the "Third Semester" synopses and episodes return to the main cast. The anime's structure has been compared to "Azumanga Daioh", with thematic influences from "Full Metal Panic? Fumoffu". In places it makes deliberate use of unconventional nomenclature; the title of episode 25 of season one is a set of pictograms, while episode 26's title has 187 characters in the Japanese original. In season two, the Japanese title for episode 26 consists of just a period.