You died in the old world due to working too much and being exploited by your superiors. When you open your eyes, you see that you are in another world. You meet a girl, her name is Menou, she guided you and worked with you to learn magic, you are very happy, because now your life will be different from before

However, when you developed your ability, she prepared a knife and stabbed you in the back of your neck to kill you. Luckily you were able to dodge, she saw that and frowned and said

"That's pretty good for a newbie. Now I'll kill you right away, it won't hurt you bastard."