Slime Taoshite 300-nen, Shiranai Uchi ni Level MAX ni Nattemashita

The protagonist has reached the maximum level possible in the game

The Daughters Arrive

An elf arrives at the location

The group attends a dragon's wedding ceremony

Azusa and Beelzebub help a ghost named Rosalie possess Halkara to leave her factory.

Halkara cannot hire workers because a ghost haunts her new factory. Afraid of spirits, Azusa summons Beelzebub for assistance. Beelzebub forces the spirit to appear, revealing she is Rosalie, a teenage girl who committed suicide centuries ago after her parents sold her to a cruel husband. The factory was once her family home, trapping her ghost there. Beelzebub explains that possessing a human allows a ghost to leave the area. Azusa offers Halkara as a vessel, which excites Rosalie. At Azusa’s home, Rosalie realizes she is stuck in Halkara’s body, a situation Beelzebub warns could be fatal. Attempts to remove her fail until they get Halkara drunk, allowing Rosalie to exit. Rosalie then uses magic to dispel rumors by helping villagers, enabling Halkara to resume hiring.

Azusa Creates a Dress Spell as the Demon King Arrests Halkara

Beelzebub informs Azusa that she will receive the Demon Medal of Honour for ending the dragon clan war, requiring a trip to the Demon Realm. Rosalie fears she cannot wear a nice dress because ghosts remain in their death outfits, so Azusa invents a spell to transform her. They travel on Fatla, a giant flying whale demon carrying a luxury hotel run by her sister Vania. Upon reaching the demon capital Vanzeld, they meet the Demon King, Provat Pecora Allieres, who admires Azusa and Halkara’s Nutri-Spirit drink. Unaware of Provat’s status, Halkara makes rude remarks and grovels for forgiveness. Provat finds this amusing and forgives her, but Halkara head-butts her while rising. Consequently, the unconscious Demon King’s attacker is arrested and sentenced to death.

Azusa Awakens Provat and Navigates Unwanted Servitude Obligations

Azusa uses a foul potion to wake Provat, who challenges her to a duel after accusing her of poisoning. Azusa breaks Provat’s sword, leading Provat to declare Azusa her big sister and demand she be called Pecora. At the medal ceremony ending the dragon war, Pecora honors Azusa, Laika, and Flatorte, forcing Flatorte to let Azusa touch her horns. This gesture binds Flatorte to Azusa as her master, requiring eternal service or suicide. Azusa realizes Pecora manipulated her into taking Flatorte home. Exploiting a loophole, Azusa commands Flatorte to act independently, technically freeing her from servitude. However, Flatorte chooses to stay, calling Azusa Mama, which sparks immediate sibling rivalry with Laika.

Azusa encounters a fake witch impersonating her while resolving a bickering dispute

Laika and Flatorte argue until guild member Natalie reports a boar infestation, prompting them to hunt the beasts. Beelzebub and Fatla organize a feast, after which the pair confess their fighting stemmed from competing to sleep next to Azusa, who allows both to share her bed. Azusa discovers an imposter and investigates with Laika, accidentally entering a masochist pub where they demonstrate a knack for abuse. The culprit is revealed to be Eno, an old woman who transforms into a young witch. Eno seeks fame as a medicine maker but fears recognition. Azusa proposes she market her remedies as an idol, granting anonymity alongside popularity. The strategy succeeds, leading Eno to seek further business advice, with Halkara considering her as a factory partner.

Falfa Becomes a Slime and Seeks Help from Intelligent, Magician, and Fighter Slimes

Falfa transforms into a slime and cannot revert. Beelzebub directs them to Intelligent-Slime in Pecora’s castle, who points to Magician-Slime on a mountain. Magician-Slime explains Falfa is in her sleep form due to a muscle strain and suggests seeking Fighter-Slime, who gained human form through martial arts study. Azusa and Beelzebub enter a tournament to find her. Beelzebub defeats Fighter-Slime, who helps Falfa change back. Beelzebub challenges Azusa to the final match to settle their rivalry. Azusa refuses to lose in front of her daughters and defeats Beelzebub again. Beelzebub notes Azusa’s growing fame will cause more issues. Fighter-Slime attempts to join Azusa but flees after sensing the slimes she killed, becoming Beelzebub’s student instead.

Kuku Overcomes Stage Fright to Perform at Demon Music Festival

Rabbit-girl musician Schifanoia visits Flatta village, but her Death Music fails to impress. After fainting from hunger, she is taken in by Azusa, who learns her real name is Kuku. Kuku reveals she has been a failing musician for sixty-three years and considers quitting. Azusa encourages her to persist if it brings joy. Flatorte notes that Death Music is outdated and Kuku lacks talent. Azusa suggests a style change, prompting Laika, Halkara, Falfa, Shalsha, and Rosalie to sing various songs. Inspired by Azusa and her family, Kuku abandons her persona to write a new track. Beelzebub hears the song and demands she perform at the demon music festival. Despite severe stage fright, Flatorte supports her, leading to a successful performance of “Thank You” to massive applause. This breakout moment results in hundreds of concert offers. Kuku thanks everyone, particularly Flatorte, who advises her to play whatever style makes her happy.

Azusa Turns Into a Child After Eating a Magical Mushroom

Halkara feeds Azusa a magical mushroom, turning her into a child. Laika and Flatorte are delighted while Azusa is annoyed. She summons Beelzebub, who takes her to Pecora. Pecora directs Azusa to a dungeon in a giant World Tree where an alchemist lives. Azusa expects danger but finds the tree is a 108 floor tourist attraction with increasing ticket costs. They stay overnight on floor 38 and floor 84. At floor 108, a young alchemist gives Azusa pills made by Eno. Eno arrives, surprised Azusa climbed when wyverns could have flown her, noting the medicine is sold near her home. Azusa returns to Pecora’s castle and takes the pills. Forgetting to change clothes, she grows naked, delighting Pecora. Tired and dirty, Azusa insists on bathing together, with Pecora chasing her around the bathroom.

The narrative focuses on the establishment and operation of a newly opened coffee shop.