Numa Giri (a Touhou LW original) refers to mist that forms above marshland. It is the temperament of Komachi, who has long overseen the passage of souls between worlds as a member of the Spirit River Railroad. Komachi's temperament has undergone soul modulation at the fundamental level. Souls are hard to control, but the employees charged with their management at the Spirit River Railroad do not allow change (Moon Essence) or selfishness (Star Essence).

The ability of Komachi Onozuka from the Spirit River Railroad (a Touhou LW original). It is essentially unchanged from our version of Komachi's ability. However, since there are many mysteries surrounding the railroad and those associated with it, it's predicted that some things about this Komachi's ability are fundamentally different, just as they are for Eiki's. Originally, her ability to manipulate distance was used to cross the Sanzu River, but it seemingly comes in handy in this world too, where she works as a train driver. No one alive knows of the worlds after death. Perhaps those with memories of their previous lives do, but supposedly even the Children of Miare don't recall everything from their previous lives, despite their perfect memory. However, it's known that after you die, the first person you meet is a shinigami. Or, as a famous rakugo puts it, a shinigami is the last person you meet before you die. Even in this world, Komachi Onozuka insists she's not a stereotypical shinigami that reaps life from people... Although, she may say something entirely different depending on who she's talking to. Whatever the case, it would seem the person you meet after death is undoubtedly a shinigami like Komachi. Since this world's Komachi works for the railroad, perhaps when you first awake after death, you find yourself aboard a train. Gently swaying on the subway with no way to tell where you are is strikingly similar to crossing the Sanzu River. There are countless tales from around the world of underground tunnels that lead to other worlds... worlds beyond death. Those tunnels exist amidst layers containing the history and memories of the Earth, and passing through them reactivates those memories via a mechanism similar to electromagnetic induction. The memories may show the past, a future based on that past, or a present that could never exist. They may show what's occurring in far-off lands or in distant galaxies. Or maybe, just maybe, they show visions of those you long to meet but no longer can. Traveling between worlds is built on the impossible, but for those who hold a desire to return home, it is not always a good thing. Keeping alive those who shouldn't yet die is another task of the shinigami. Perhaps one day you'll wake to find yourself on a strange train with phosphorous sparks streaming by the window like so many stars. If you do, you'd be wise to explain your situation to the friendly, laidback train staff. "Big Puncher" is the name of Komachi's prized scythe now that it's been spiritually modified into a ticket punch. The Japanese kanji for sin is carved into the base, and when she strikes the ticket punch down, blades pop out, leaving the kanji imprinted on passengers' tickets. Being able to clearly identify sinners makes Eiki and Kutaka's jobs far easier. Which is the same reason Komachi often makes small talk with the souls aboard the train. After all, talking is the best way to get to know someone, human or otherwise.