In order to learn more about Sensei's movements, Mikado and Hiyakawa make a plan to astral project into his house with the help of Mukae, Erika, and Sakaki. But they discover that Sensei's house was built on the site where the Palm of the Hand Research Society used to stand. Mikado recommends that they call off their plan out of concern for Hiyakawa, but Hiyakawa calmly replies "I won't remember. I never forgot."
or things you don't want 
to forget... anything like that?
أو أشياء لا تريد نسيانها... وما شابه؟
Etwas, was du nicht vergessen willst?
algo que no quieras olvidar
o alguna cosa así?
algo que no quieras olvidar,
o alguna cosa así?
ou un objet à la valeur sentimentale
inestimable ?
ou coisas que não quer esquecer?