Konosuba: An Explosion on This Wonderful World! 

Crimson Demon Village is deep in a steep mountain forest. Red-eyed Crimson Demons live there. A young girl joined Crimson Prison's magic school after being drawn to crimson explosions. She wanted that day's scorching, dazzling magic. Megumin, later an Arch Wizard, has an abnormal mind for explosion magic.

Megumin brought a black cat to school. Their homeroom teacher Pucchin suddenly announced a special class because the seal on one of the village's tourist attractions, Tomb of the Evil God, had been loosened and nearby monsters started moving frequently. Pucchin left the classroom after telling students to form groups beforehand. Yunyun peeked at Megumin after hearing about grouping.

One day at the library, Megumin noticed that Yunyun was reading a book about making friends with plants and felt sorry for her. Just then, Funifura and Dodonko appeared and said they wanted to be friends with Yunyun. While Megumin was worried that Yunyun might get too excited, someone suddenly appeared saying "You guys are celebrating youth!" It was the NEET Bukkororii from the village.

As usual, the top three students were announced after the exam results. Yunyun, a top student, was not called out today. Megumin noticed Yunyun's odd appearance but got no response. One day after school, Yunyun came to talk to Megumin and sat down on a bench in the park. She began to cry and asked Megumin what exactly is the definition of a friend.

The alarm of enemy attack echoed throughout the village. Megumin panicked and ran home to find the door destroyed and Komekko missing. Megumin and Yunyun found Komekko, but they were powerless against many monsters without magic. She had to give up explosion magic to save Mimi by learning advanced magic with skill points. What will Megumin do when cornered?

Megumin, who graduated from the Crimson Prison by mastering explosion magic, works hard every day to save for a trip to Arcanletia. However, the Devil King's army is suspected of nighttime explosions in Crimson Demon Village. These explosions only happen when Megumin doesn't get hired. Eris appeared at Megumin's house one day. She knelt and chanted about her "great master"...

Megumin left her village and arrived at Arcanletia, the city of water and hot springs. After a week, she struggled to make ends meet and couldn't afford the trip to Axel. One day, she declined an invitation from Axis cult. While wandering hungry in the city, Megumin heard a woman's scream and rushed over to investigate.

Due to abnormal hot springs, suspicion arose about a connection with the Devil King's army. The highest person in charge of Axis Order was taken away while Megumin and Yunyun investigated. They found an Agar Slime when turning on the faucet and were puzzled by their situation.

The Crimson Demon Clan's Megumin and Yunyun were on route to Axel, a town for novice adventurers. Monsters attacked the caravan, putting them in danger. Despite being highly respected as a "teacher" by adventurers, Megumin bravely jumped out of the carriage only to face a group of giant worm-like monsters.

Megumin and Yunyun reach Axel to find party members. They visit the Adventurer's Guild for information but fail to attract attention until Megumin runs eagerly to the reception desk during a busy time. However, other adventurers are unimpressed due to a recent promotion of someone with stronger magical power. Despite this, they receive many team invitations and eventually join one.

Megumin and Yunyun met Host, a high-level demon who introduced itself like a Crimson Demon Clan member. They rushed back to Axel to tell the guild. Despite the guild's efforts, even the Magic Swordsman was defeated by Host. The group desperately sought help from the aqua-color hair archpriest to save them.

Megumin bravely confronts the powerful demon Host to prevent trading Chomosuke. With the help of one million Eris worth of equipment, she prepares for the fight, struggling to fall asleep the night before. At this moment, Yunyun secretly sneaked into Megumin's room and began to speak her mind…