Gaiden 1

The Birth of the Legendary Heroes (伝説の英雄達の誕生, Densetsu no eiyū-tachi no tanjō) is the first extra story of the Kenja no Mago series.

Short Summary
35 years ago, before Shin met Merlin, at the Earlshide School, Merlin was a troublesome boy, Melinda was a brilliant girl and a prodigy named Kyle was living a ruthless life in college. When Merlin and Melinda's began dating their relationship spreads to the city. Kyle who received reports of it congratulates them but is actually burning in jealousy. After graduation, Merlin and Melinda became hunters while Kyle became a magician.