マーハ
from The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat
Maaha (マーハ) is the representative deputy of a cosmetic brand made by Rogue. She backs him with financial resources, information gathering, supplies, etc. She has long dark blue hair with two star-like hair pins and blue eyes which are the same color as her hair but turn reddish in the lower half.

The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat
When a great assassin is reborn in another world, he finds himself the heir to a long line of killers from the shadows. With both his modern-day knowledge and experience and the special magic and techniques of this new world, he could very well become the most unstoppable assassin in history…! [Yen Press]