Episode 143 takes place during what many fans consider the "Golden Era" of Detective Conan animation. The late 1990s episodes featured a distinct cell-shaded art style, moody atmospheric lighting, and intricate puzzle designs that define the nostalgia of the franchise. Even though Episode 143 is an anime-original episode (meaning it does not appear in the original manga by Gosho Aoyama), it perfectly captures the suspenseful, locked-room mystery style that made the show a global phenomenon.

available. Depending on your region, many classic or newer episodes can be watched for free with ads, or via a free trial of their premium service on the Crunchyroll platform Tubi / Pluto TV:

Crunchyroll offers a free tier that allows users to watch select catalog titles with commercial interruptions.

The episode also explores themes of identity, reputation, and the consequences of one's actions. The character development is well-done, with Conan's character shining through as a brilliant and determined detective.

" (1999), Ran, Sonoko, and Conan visit an observatory to watch stars. The night turns dark when a "Star Pioneer" award winner is found dead after a suspicious fall from the observatory's upper level.

This episode is a classic example of the "How-catchem" style, where the mystery isn't just about did it, but

The episode begins as a peaceful getaway when Sonoko Suzuki invites her best friend Ran Mouri and the young prodigy Conan Edogawa out for a night of stargazing. They meet up with a group of university students majoring in astronomy at an observation tower.

A: Ideally, watch Episode 129 ("The Girl from the Black Organization") first to understand who Haibara Ai is. However, Episode 143 works as a standalone thriller.

Episode 143 Overview: The Mysterious Astronomical Observatory Murder Case

A quick note: The information I found about Plex is recent as of late 2025. Because streaming libraries update frequently, availability could have changed since then.

: This free streaming service features dedicated anime channels that broadcast Detective Conan on a loop, alongside an on-demand section where classic episodes occasionally rotate.

Detective Conan (also known as Case Closed ) remains one of the longest-running and most beloved anime series in television history. For decades, fans have followed Jimmy Kudo (Shinichi Kudo)—a brilliant high school detective shrunk into the body of a child after being poisoned by the mysterious Black Organization. Operating under the alias Conan Edogawa, he solves complex crimes while searching for a cure.