Origin
Altia
Anastasia was a former assassin sent to dispatch against Taichi and Rin. After the duo spared her life, she decided to join the guild to get more closer to Taichi. She has greenish - yellow hair with clear blue eyes. She is introduced in a black cloak with a hood, but once she was captured and later released she wore a revealing green dress with blue earrings and cloth "arm covers?" So far nothing has been shown about her past other than her being an assassin prior to her meeting Taichi and the others.

Isekai Cheat Magician
As regular high school students Taichi and Rin disappeared in a beam of light. When they came to, the two of them were already in a world of swords and magic. Finally getting away after experiencing an attack by monsters, following the suggestion of adventurers they headed on the path towards the guild. In the guild, the two of them found out that they possessed unbelievably powerful magic. Thus the regular high school students transformed into the strongest cheats...