What is the ending of Konosuba light novel?
Well, at the end of the Konosuba light novel, the group overcomes the big bad, the Demon King. Their journey to this point has been filled with so many zany situations. Kazuma has developed deeper bonds with his comrades. Aqua has been... well, Aqua, with all her goddess - like yet ditzy behavior. Megumin is still obsessed with her powerful Explosion spell. And Darkness, she's still into her masochistic tendencies. But together, they've reached a point where the world is at relative peace, and they can continue their wacky adventures.
The ending of the Konosuba light novel sees the resolution of the main plot which is the fight against the Demon King. Kazuma, Aqua, Megumin and Darkness all contribute in their own ways. After the victory, they continue to live in the fantasy world. Their lives are still full of chaos and hilarity as they are still the same unique characters with their individual quirks. For example, Megumin still loves to use her Explosion magic despite its drawbacks.
In the ending of the Konosuba light novel, Kazuma and his party manage to defeat the Demon King. Along the way, they've had many comical and adventurous experiences. Kazuma remains his somewhat lecherous yet heroic self. And they all kind of find their place in the world they've been adventuring in, with relationships between the characters growing and evolving in the typical Konosuba wacky style.