Ikinari Maou

No, you can win!
With your wisdom, strength, ingenuity and effort, the weakest hero will defeat the Demon King. Use tools, magic, and anything else you can. If you still lose, the voice of heaven will give you a hint. Please lend your strength to the reckless hero until he defeats the Demon King!

"Ikinari Maou" is a [retro RPG style command battle type puzzle solving game].
Final bosses such as the Demon King and the even more powerful Great Demon King.

Résumé

The story begins with a battle with the Demon King, the final boss!
However, the hero is only "Level 1"
so there's no way he can win!