This is the first issue of the Mario vs. Wario comic which maybe explains a little about why Wario is so bitter towards Mario. It's From Nintendo Power magazine vol. 44 published way back in January 1993.
This comic followed on from the twelve part Super Mario Adventure comics. Illustrated by Charlie Nozawa, story by Kentaro Takekuma copywriter Leslie Swan of Nintendo of America. You can also click here to read Mario vs. Wario Issue #2
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