Was it the laser-gun weapon Yayoi has in her finger which she uses to kill ghosts?


In the series, Yayoi has shown several tools to trap, handle or kill ghosts,
like dolls, salt, other ghosts, etc. Recently she has used a laser-like weapon
she fires from a glove-like cloth she has in her finger, which she uses to
kill ghosts. What is it, and why does this have this power?

