The story begins with receiving an anonymous love letter, which immediately makes Conan (Shinichi) jealous and anxious. While Ran struggles to decide whether to meet the sender, she, Conan, and Sonoko cross paths with a woman whose home was recently broken into.

Are you looking to watch this specific episode, or would you like a available in the new curated collections? Detective Conan Rewatch: Episode 426 - Tumblr

The group investigates the break-in at the Tono household. This eventually leads them to a construction site where a man, Shuhei Naga, is being assaulted by a culprit named Yasuda.

Ran saves Shuhei by knocking out the culprit with a powerful neck kick. It is revealed that Shuhei was the one who had once sent a love letter to the lady whose house was broken into (his late friend's wife) to thank her for her past kindness.

" . This is a filler (anime-original) episode that first aired in Japan in January 2006.