Fourth season of Aggressive Retsuko.

Tatsuko of class 5-1 is really excited about the upcoming school sports festival, her proposal for a new "Eel Scooping" event is less than enthusiastically received though, especially by Suzuka. Illya mentions the main event dance to Miyu, and as teacher Taiga Fujimura points out, it entails a huge reward, but will require quite a bit of practice. And so the close friends: sarcastic Nanaki, level-headed Suzuka, excitable Tatsuko, energetic Illya, shy Mimi, and reserved but athletic Miyu are off to win the dance event for the honour of their class and for Fujimura, who seems to have some saucy bet going on that she most definitely needs to win, or so the girls misunderstand. (Source: AniDB)

Six thousand years ago, mankind's glorious reign ended as a result of an invasion of the demon race, brought about by the emergence of 72 demon gods. To safeguard the remnants of humanity, the Alliance of Temples appeared to stop the demons' progress and temporarily stabilize the situation. At present, nine-year-old Long Hao Chen is training to become a part of the Knight Temple Hall. Through sheer dedication and the support of his companions, he passes the knight exam. Now, under the tutelage of his teacher Long Xing Yu, Long Hao Chen endures the Holy Resurrection Ritual to ascertain his capability. The ritual reveals that Long Hao Chen is a Son of Light—an individual who possesses a vast amount of spiritual energy. Recognizing his disciple's promising potential, Long Xing Yu urges Long Hao Chen to become a strong knight capable of defeating the Demon Lord alongside him. With countless challenges awaiting him, Long Hao Chen may be the warrior that can end the era of darkness.

Nozomu Itoshiki is still the bizarre teacher of the even stranger Class 2-F. He attempts to teach his students the negative aspects of the world and society, only to have each circumstance thrown at his face whenever he tries. With more students and friends than before, Zetsubo-sensei's life becomes harder and crazier than ever before. (Source: ANN)