Một âm mưu lâu dài xoay quanh một sức mạnh bí ẩn do Nữ hoàng nắm giữ ở Raja, một quốc gia nhỏ ở phía tây Tempest. Khi một con slime tiến hóa thành Chúa Quỷ tên là Rimuru Tempest tình cờ gặp Hiiro, một người sống sót của tộc Ogre, một cuộc phiêu lưu kỳ thú với nhiều nhân vật mới bắt đầu. Sức mạnh của trái phiếu sẽ được đưa vào thử nghiệm!

Mio is a girl in high school who slacks off. She and her childhood friend Arata and best friend Madoka spend their after-school days in Ikebukuro hanging out. One day, Madoka tells Mio that she loves Arata, and Mio realizes that she loves Arata, too. But she’s scared of their relationship falling apart and lies, saying she’ll help them. Mio deliberately acts coldly to Arata, and they get into a fight. She decides to work things out with Arata, but gets into a car accident on her way to meet him. She wakes up in a mysterious world. It's the Ikebukuro she knows, but something’s different...

At the risk of her group's safety, a young woman travels into a National Forest where her sister has become trapped in a multi-dimensional world of monsters.

Due to a spacecraft malfunction, saleryman Ryu and his robot companion "MOS-01" crash land on the space ship/planet Gdleen. Ryu meets a cute Euredonian fairy called Fana and the two are soon entangled in a long standing war between the monsterous Babaress and the spell casting Miyorl tribes.

In a city of a parallel world. A boy finds a pair of broken scissors from his father's belongings after he passed away. And a boy's mother tells him that his father had been a gardener in the past. Then he figures out the scissors were made by Sasuke, who is an artisan living in a foreign country. The boy travels all the way to a place where Sasuke lives in order to get his scissors fixed.