転生した中ボスはレベルを９９９にして主人公を迎える〜勇者はカンストレベルを９９と見誤っているようです〜 (Associated Names)

Let’s snatch the items from the jar beforehand. Oh, and also the heroine candidates, right? The protagonist, Tsunaka Hajime, was reincarnated as the son of the demon duke, Zaus Jarmel. It seems his memories from his previous life have awakened. In his past life, he was a corporate s*ave, worked to death from overwork. He…