When the entrance to the 4 O’Clock Library is revealed, Kou accompanies Nene inside, and it isn’t long until she finds her own book. She can’t resist the temptation to read ahead into the future, whereupon the book starts to turn red with blood and the Fifth Wonder attacks. Kou forgets his staff was sealed, but Hanako-kun arrives to save them.
Turns out the fifth wonder’s manager Tsuchigomori-sensei, was only teasing them. Hanako-kun is the leader of the seven wonders, who are dedicated to keeping the supernatural peace at the school, but one one of them is working with a human like Nene, only stirring up trouble. His solution is to temporarily sap the wonders of their power by neutralizing their Yorishiro.
Hanako chooses Nene to accompany Tsuchigomori to the site of his Yorishiro, which turns out to be a moon rock Hanako gave to him back in the sixties during the moon landing. When he was alive, Hanako was Yuji Amane, a Tsuchigomori was his homeroom teacher who was always concerned about Hanako getting bullied and beaten up.
Hanako was the only human Tsuchigomori knows about who was able to change the future as written in his book. Hanako’s book said he’d have a future as a science teacher at the school, but he died when he was still a “brat”, which Tsuchigomori considers a tremendous shame.
The flashback plays out like Yako’s, with Nene experiencing his memories as if in a dream. When she comes to, she’s in the infirmary. As she desired, Nene now knows a little more about Hanako, including his real name and enthusiasm for space and science when he was alive.
But as she greets him with an almost maternal hug, he can tell she’s learned something about him, and if anything seems a bit miffed. Still, he can hardly have expected to keep all his secrets secure considering the amount of time Nene is spending with him.