Jump Multi World

Jump Multi World (ジャンプマルチワールド) was a special event held for the 25th anniversary of the Weekly Shonen Jump.

Summary
Being held from July 28, 1993, to August 15, 1993, visitors could see an exhibition of original drawings by with works serialized in Weekly Shonen Jump at the time of the event. The event also showcased anime, games, and merchandise exhibits. The event acts as the predecessor to the now annual event. It cost 700 yen in total for the admission to the event and the special pamphlet that was handed out to visitors.

The content of the pamphlet includes the history of Weekly Shonen Jump and records broken by the magazine's publication. The notable section of the pamphlet is its "JUMP MUSEUM" section, which includes information on various Weekly Shonen Jump series and its creators. Alongside a comment from the artist, they also made original illustrations with some of them also including an original comic strip. Examples of the series being presented include ', ', JoJo's Bizarre Adventure, ', ', ', ', ', ', ', ', and many others. Additionally, the pamphlet comes with posters showcasing the main characters of the serialized manga at that time.

4-Koma
On the JUMP MUSEUM page about Hirohiko Araki and JoJo's Bizarre Adventure, during the serialization of Diamond is Unbreakable, Araki made an original 4-Koma comic strip based on Diamond is Unbreakable as part of the original illustrations created for the pamphlet.

First panel: Two students are seen having just ended their friendship. The green-haired student states that he and the other student are through as friends. The blue-haired student asserts that he hopes he never has to see him again. "Josuke Higashikata" sees the two of them and comments that this is the sound of a friendship breaking apart.

Second panel: Josuke exclaims he'll fix that broken friendship with his "Crazy Diamond." Crazy Diamond starts doing a punch barrage while shouting its Stand Cry, "DORARA!!".

Third panel: Josuke pauses and states that not even his Crazy Diamond can heal people's hearts and that he had forgotten about this.

Fourth panel: Josuke then remarks he forgot that it couldn't bring back the dead either, as Crazy Diamond's punch barrage killed both students with their now bloody bodies lying on the ground. He walks away from the scene, expressing that his kindness had worked against him at this moment, and lastly says goodbye.

Note: It clarifies that the Josuke Higashikata depicted here in this comic is not the same character as the one shown in JoJo's Bizarre Adventure. The note ends by stating that this Josuke will never be seen ever again.