Old Teacher (from behind) "At the time, I lived in Nebukawa. But now it's at the bottom of the sea…"
SE <<Students getting up from their seats>>
Students:“"Eh? The new student was?" "I knew it."”
Classroom Chatter:“"Say what?" "Really~!" "Cooool." "Ohhhhhh." Etc.”
Reichu: Nebukawa is (or was, here) a fishing village just southeast of Tokyo-3.