Hakumei (a Touhou LW original) refers to the faint light of the sky before sunrise and after sunset. This is an apt temperament for Seiran, an inhabitant of the enormous Capital that follows a singular fate. Her original temperament has been changed beyond recognition by the great systems of the Capital. This temperament is specialized to solely resist Earth Phase.

The ability of Seiran from the Capital (a Touhou LW original). Her ability doesn't appear to be any different from the usual Seiran... but it's hard to tell for sure because not much is really known about this ability. It seems to allow Seiran to shoot bullets from a kind of subspace. Perhaps this space is similar to Yukari Yakumo's gaps. This world's Seiran can apparently manipulate more than just bullets. She can interfere with concepts that exist in other dimensions. More specifically, she uses her ability to read other people's thoughts. This is how she accomplishes her job as a Thought Investigator. The Thought Police are a part of the Truth Temple, controlled by Sagume Kishin, and their main duty is to police criminal thoughts and protect their sisters (the general populace) from them. Seiran's role as an investigator of the Thought Police is to actively seek out and punish criminals who harbor criminal thoughts. Thoughtcrimes are incredibly dangerous, and in the Capital, they are treated in the same manner as impurities, making Seiran a champion of the people. It goes without saying, but generally, directly reading someone else's thoughts is impossible. That's why the Thought Police use other means to make it look like they can... However, it seems Seiran can actually read minds to some extent. And if you thought this sounded a lot like the ability of satori youkai, then you'd be right. Seiran's thought investigation methods are very similar to the mind reading employed by satori youkai. Satori youkai forcefully awaken memories from the depths of a person's mind by making them relive their past trauma. Seiran, on the other hand, first identifies the indecipherable depths of someone's mind as another dimension, and then she shoots thought bullets into this dimension. The bullets form a path and force the person's hidden thoughts to the surface of their mind. (There is always a safe path through the bullet patterns in battles of bullets.) These thoughts are then expressed by the person in the form of words or actions. And if Seiran can pick up on these expressions, she will obtain the same information as if she read the person's mind directly. It is not known why her method so closely resembles the ability possessed by satori youkai. Perhaps it's just a coincidence.