Shinobu and her class are preparing for a play for their school's cultural festival while Aya feels a little distanced from Shinobu for not having any elementary school memories with her. The story will takes us back to the past where Shinobu, Yoko, and Aya in their third year middle school year are preparing for their highschool entrance exam.。末世降临,世界各地随机出现了特殊领域,领域内遍地丧尸,只有成功挑战领域和找到“安全屋”的人,方可离开领域并获得属性提升和资源。上一世,叶然在通关最终领域时,惨遭队友背叛,惨死在领域之中。再睁眼,重回到了末世前一个月……。