Detective Conan · Season 1 · Episode 421
Gingko-Colored First Love (1)
Monday, November 21 · 25 min · ★ 8.0 on TMDB
The Detective Boys are at Agasa's house when they happen to find a letter from Agasa's first love. Apparently they are supposed to meet every decade but was unable to because Agasa could not solve the code from the letter.