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.