My starting summon is a small skeleton - Chapter 194 - 191 enters the instance

Zaria of the village of Latian. A former skilled mercenary with a strong, beautiful face and a tall, voluptuous body, she fell in love at first sight with the kind and gentle villager Albert, and since then has quit rough work and lived as a married woman devoted to him. It seemed as though their happy days would continue forever, but one day her husband Albert was injured at work, and he was barely able to stand or walk. To cover her immediate living expenses and her husband's medical expenses, Zaria uses her “previous job” to become a sword instructor for the son of a certain lord, but...

[Disclaimer: Gore and Mature Content]Kaiser, an orphan, had left Germany to live with his uncle in Lewis Center, USA. Far from his tragic childhood, he befriended five unconventional boys. Together, they hung out, endured boring classes, and faced rejection from girls. Their ordinary lives took a drastic turn when Ben, one of them, was bitten and turned into a vampire by his crush.The revelations kept coming when Yuki, another member of the group, confessed to being a Zodiac—one of the last hunters tracking down Wunders, malevolent supernatural creatures.Kaiser soon discovered a dark world where all his suspicions turned out to be true… And the Mysterienkult was after him. His mother’s tragic death had not been an accident after all.

It has been more than ten years since he was transported to another world. The protagonist Deris Fahrenheit, who has became a magician with special circumstances, was freely enjoying his life in this world. However, a girl appeared before him and asked him to make her his disciple. That girl seems to be a transported person――

It’s a story of him who becomes the girl’s teacher and trains her to achieve her revenge (?) in otherworld.