Cool Shock B.T.

Magic Boy B.T (魔少年ビーティー mashounen bītī) is a short Japanese manga series written and illustrated by Hirohiko Araki and was published by Weekly Shonen Jump from 1982 to 1983. The manga is split into 6 chapters, contained in 1 volume.

Araki's other manga, Gorgeous Irene also features Araki's other works including Magic Boy B.T.

Synopsis
The creator of Baoh and Jojo's Bizarre Adventure presents a manga about magic and mysteries! You'll meet him at 13:13 pm, on Friday the 13th. He'll do an uncanny intro where he plays a trick on you! And wherever he goes, trouble seems to always follow. Who is this person who creates such incidents? None other than Cool Shock BT!

Trivia

 * The main character, BT, has a similar appearance and stature to the Jojo's Bizarre Adventure main antagonist, Dio Brando and may be a possible reference to the character. BT also might have been base to teenage Joseph, who also used magic tricks and foul play to beat his opponents (most notable in fight with Esidisi).
 * The arrows featured during the internal monologue scenes in the anime are an homage to Magic Boy B.T. In the manga, the arrows appear whenever BT is scheming.