The novel light from Konosuba It came to an end on May 1 with the release of Volume 17. Reason why some fans have wondered things like “How did Konosuba end up?” y “Who did Kazuma stay with?”, and thanks to those fans who were able to acquire the light novel of Konosuba We can share a summary of the ending.
End of end spoiler alert Konosuba!

Summary of Konosuba Volume 17:
Megumin Start shooting quick blasts in the castle. The demonic army panics and begins sending troops to try to stop the explosions, but they all explode even before they get close. Finally, a kind of angel appears that He says that he is the strongest of the magic launchers, but explodes. He survives, but his clothes don’t. Finally, he retreats to the barrier and begins to strengthen it, pointing to a war of attrition. Megumin Shoot 10 explosions in a minute, breaking the barrier and clearing the angel from the face of the earth.
Kazuma and the others quickly meet Yunyun and Mitsurugi, who began to run towards the entrance after hearing the explosions. They think the explosions were caused by the Demon King, until Kazuma say what Megumin I was behind the explosions. Yunyun is not satisfied, since she and the group of Mitsurugi could have been affected by the attack. aqua He managed to get lost, while everyone ran.

while looking for aqua, , Kazuma He found a big red button that said “Please don’t press”. He realizes that it could be a trap, but he thinks the button is actually a secret passage leading to the room of the Demon King. so it ends up becoming to find with aqua.

aqua is happy to see Kazuma. The two talk about teleporting to Axel, but Kazuma He doesn’t think the rest of the group will return without meeting them. They hear voices approaching. Kazuma He manages to find a pot to hide, but it is full of water. aqua Try to take the pot like a hiding place (than you can breathe underwater). The two are immediately discovered (Kazuma Try to use the concealment of the presence, but there is a specter that sees the aura of the goddess of aqua).
The situation looks very bad for both of them, but aqua makes Kazuma Blind your enemies, what you do with a new skill”Flash“that blinds aqua too. The spectrum (called pain) has no eyes, so it is not blinded. the spectra and Kazuma They fight, forming a team for the “Drain Touch“But finally aqua Use her goddess powers on the spectrum after she regains sight. Kazuma It ends up teleporting a Axel, leaving only his armor (which for some reason was immune to teleportation). So that Kazuma He returns to teleport a henchman to Axel, leaving only his armor.
Kazuma Take the armor of the henchman and pretend to be him. aqua, and informs the head of the floor, suggesting that they use aqua As a bait to attract other intruders (everyone in the demonic army is suddenly upset by the low-level villain his comrade has become). While the army waits for the intruders to be caught, they interview aqua about the intruders. They even give her tea, which she purifies several times.
aqua annoys to Kazuma causing all the demons to be scared and gives the group time to get there. to distract the demons, Kazuma (disguised) begins to intimidate Darkness. while the other demons withdraw with disgust, Kazuma begins to force Darkness to remove the armor. This distraction works well enough for Kazuma He can slip behind the boss’s back and stab him with a poisoned dagger. The group manages to kill all the demons there in the chaos that follows.

Then the group talks as they head to the front door, aqua suggests that everyone teleport, but Kazuma remember that aqua He wants to return to heaven.
He makes sure that aqua Do not try to revive anyone if someone dies: they will simply pick up the body and teleport and revive them later.. Darkness Suddenly ask if Kazuma He still has the ring he stole from Iris, so he begins to demand Kazuma give the fatal blow to the Demon King (In addition, whoever kills the Demon King has the right to marry royalty).
the plan of Kazuma It’s slipping behind the Demon King And stab him in the back, but before he gets to the half, they cut his head off Kazuma.
so it ends in front of ERIS, , Kazuma He makes some of his usual complaints. However, ERIS He’s trying to cheer him up for some reason. ERIS Apparently he wants that Kazuma be in a fight condition when he returns. Kazuma Try to say that it’s over, but then listen to aqua trying to revive it.
Darkness and Megumin They have gone crazy, now that Kazuma He is dead. Megumin is threatening to make everyone explode with an explosion, and Darkness is supporting her. aqua is using his distraction to revive Kazuma.
ERIS tells Kazuma his plan, which consists of Kazuma I sneaked up on Demon King and teleport it to a dungeon. According to ERIS, the Demon King He will not teleport back, due to his pride and Kazuma You can fight him, one by one. ERIS points out that Iris is using Aegis to fight the daughter of Demon King, and is also in trouble. And he explains that when the Demon King Be defeated, all the monsters will weaken. Kazuma finally agrees with the plan and receives a “blessing” from ERIS.
Kazuma manages to teleport to the Demon King to a dungeon, but the Demon KingIo believes that he is only there to buy time, so he begins to teleport. until after a series of provocations, including the theft of a scarf embroidered by his daughter, the Demon King He finally gets ready to fight. Then Kazuma It escapes.
What happens then is a cat and mouse game, where Kazuma It sets traps, throws dynamite and all kinds of explosives, which practically only serves to irritate the Demon King. So finally Kazuma You realize that if you use Manatite, can actually cast spells with some damage. He manages to create a giant land golem. Although, the Demon King It also has its own golem.
Finally, the duel ends with a hole in the shoulder of Kazuma. As a reward, the Demon King reveals his name that is Kouichi Sakaguchi, and it is at this moment where it gives you time to perform a teleportation spell. The Demon King promises to tell Kazuma The secret of his name if he defeats him. Kazuma Look at his adventurous letter and notice something weird. When the Demon King Fold the corner, see a magic light in the hand of Kazuma And he starts to panic. he asks Kazuma If you really don’t want to know the secret behind your name, or why you are attacking humans, and Kazuma Respond with a “no”. Subsequently, it launches an explosion.

Kazuma ends in the sky, and aqua He is also with him. while you cry, aqua It gives you three options: reborn in this world, return to Japan, or go to heaven. Then ERIS gives him two more options because he killed the Demon King. You can go to Japan with all the money you want and your ideal partner, or you can return as you are. Axel. Although apparently aqua Can’t go back to Kazuma, because the other world is outside its jurisdiction. Then Kazuma makes his wish to have defeated the Demon King.
In the end, Kazuma resurrect and return to Axel, next to ERIS. Later, aqua Come down and end up crying to stay behind. Kazuma he murmurs that he has a way to recover aqua, and tells him that everything will be fine. Only the demonic army begins to teleport back to the castle. Megumin It shoots some last explosions, and the group starts to teleport. aqua stays until the end to give Kazuma A … “Thank you”, which makes your heart feel something for her, for the first time.

KonoSuba epilogue Who stays Kazuma?
In the epilogue of Konosuba, we see how Kazuma It’s back in the sky and ERIS he wonders about what killed him. Kazuma Give an update on what has happened to others characters. He explains that Megumin will go somewhere with Yunyun to make his first explosion of the day (the ancient castle of the demon king), while Darkness It has a province and is now receiving many suitors.
Kazuma He complains because he was expelled from the house, why he said, “Dad’s going to take a harem!” ERIS he comforts him and says that he can wait while aqua revives it. Except that Kazuma He didn’t die. He recorded the sky as a teleportation place. That was how he was going to recover aqua. And just when he was about to leave, ERIS Gives you another blessing.
And that’s how it ends Konosuba, the author also reveals in the epilogue that not everything has been shown about Konosuba. which is why we could see new spin-offs and more news from the franchise of Konosuba in the future.