Third season of .

Kazuhiko Nukumizu, a self-proclaimed "background character," accidentally witnessed his popular classmate Anna Yanami being rejected by her childhood friend. Since then, Kazuhiko has become involved with several loser heroines, including Anna.

A young boy uses his scientific skills to fight enemies.

Floating in a certain ocean is an island called "EGU Island." The sole entertainment on this island is listening to the songstress, "End of the World." Day after day, the islanders are enchanted by her singing. However, this tranquil time is shattered in an instant. Since the disappearance of the songstress, the island has been filled with "anger," "doubt," and "anxiety." Various thoughts and intentions begin to stir...A licking war unfolds around, "End of the World!" The one who holds her destiny is the legendary legacy "EGUMI Legacy."