After passing away, a Japanese office worker finds himself reincarnated in another world as Ars, the newborn son of the noble Louvent family. The Summerforth Empire, where the Louvents rule over a small territory of a few thousand people, is a medieval-like land plagued by social inequality and political instability. As Ars grows older and learns more and more about his new environment, he becomes convinced that war will soon erupt. Fortunately, though Ars was not blessed with unrivaled strength or extraordinary magical aptitude, he does possess Appraisal: a seemingly unique skill that allows him to instantly grasp someone's current abilities and latent talents merely by looking at them. In an effort to prepare his domain for the imminent strife, Ars resolves to enlist the most exceptional people he can find, paying no attention to superficial qualities like race or social status.

Satou has been in love with his childhood friend and neighbor, Hime, ever since she and her grandfather appeared out of nowhere 10 years ago. Now a dazzling, yet mysterious high school beauty, she makes it more and more difficult for him to confess his feelings. As the anniversary of their first meeting is nearing, will he muster up his courage to transform their friendship into something more? Or will an entirely different fate await this tightly bonded pair?

After rescuing his master, Rias Gremory, from the Dimensional Gap, Red Dragon Emperor and aspiring Harem King Issei Hyoudou can finally return to his high school activities alongside fellow members of the Occult Research Club: Yuuto Kiba, Asia Argento, Xenovia Quarta, and Irina Shidou. The group soon embarks on a school trip to Kyoto. While peacefully visiting a temple thanks to Rias' spell, an attacking group of local youkai breaks the calm atmosphere. Once the altercation ends, the club learns that the mythical nine-tailed fox that protected the city was abducted and that someone has framed them for the act. Issei and his friends will now have to fight to protect the city and save their school trip from a planned disaster! In the meantime, Rias, who had to stay in Tokyo with Akeno Himejima and Koneko Toujou, grows increasingly restless to have left the perverted Issei alone with the other girls of the Occult Research Club. Beyond this vague anxiety, what is the exact nature of the feelings Rias has been struggling with for the past few months? [Written by MAL Rewrite]

Since reincarnating into a new world, Ryouma Takebayashi has used his god-given graces to tame countless slimes and employ them to improve the lives of everyone around him. With the astonishing success of his laundry shop, Bamboo Forest, he is finally ready to take on new frontiers and open a branch in the neighboring city of Lenaf. Abiding by his promise with his dearest friend, Eliaria Jamil, Ryouma makes every day count, whether learning new techniques, forming connections, or even discovering more species of slime.