One day, a love letter is found in Murai’s shoebox with the initial 'F' on the envelope. A female student, Kujirawaka, put the letter in his box as a favor to one of her friends. However, Fuyumi Kujirakawa’s initial is also 'F'. Kusano and Fujiyoshi think that the love letter is from Kujirakawa, but, in fact, it is from Akane Fujita, Fuyumi’s friend.
Then, Fuyutsuki, young and beautiful, is popular among male students. And, of course, female students dislike her just as intensely. One day, the girls finally kick her out of class. Losing her confidence, Fuyutsuki runs away from school. Onizuka heads toward Hakuba, Fuyutsuki’s special memorial place, taking Kikuchi, Murai, and Toroko, with him.
Afterwards, a film crew decides to blow up an old school building where Fuyutsuki and Urumi Kanzaki share a lot of memories. At first Urumi feels betrayed by a former teacher whom she trusted, but Onizuka somehow succeeds in talking her through her problems. Even so, Urumi decides to act out and sneaks into the school building filled with explosives.
And if that wasn’t bad enough, there is an epidemic of threatening superstitious mail at Holy Forest Academy. Onizuka himself receives a pile of cursed letters. But having no interest in any form of superstition, he burns them all. Next day, ominous incidents begin to befall him, and eventually he becomes ill.