Yami no Tokeitou

Depressed from her classmates' bullying, Nanako goes to the school's clock tower to spend some time alone. There, she sees Rei, smoking and throwing knives at a carving of Fukiko in the wall. Terrified but entranced by Rei, Nanako researches the origins of Rei's nickname and learns more about her from Kaoru. They part on good terms, but Aya and her friends begin attacking Nanako as soon as Kaoru leaves. She is rescued by Tomoko who threatens Aya and rekindles her friendship with Nanako.