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Hello! This is your dear author ZenAnime! (Although no one thinks that). This chapter is not a part of the series but a spin-off of Kei's past life before she met Tatsuya. Most of you must be confused but I have hinted on her past life in the earlier chapters. Also, one more thing that I forgot to say. Hope you enjoy it!
Year XX05,
A group of elite warriors graduated from the Magic academy have been nominated as the new heroes and are on their way to defeat the present strongest demon lord of that world, Beelzebub.
Beelzebub just another one of the dukes of hell had his demon seed within him to grow forcibly by sacrificing something of equal value. This lead to him becoming the new demon lord. Not only that, over the years he grew only stronger and beat most of the demon lords in battles. This made him acquire the title of 'The Strongest Demon Lord'.
"Hey! Wait up!" says the shortest kid while walking behind a group.