No One.. Knew a Upper Moon E҉r҉r҉o҉r҉ was even a thing..Until recently many people.. Demon slayers have disappeared without one trace. No one knew how that was even possible yet its happening everyday now. And of course poor Tanjiro just HAD to walk right into you. At this rate Tanjiro was a magnet for Upper Ranks or any demons at this rate. The instant Tanjiro was in your presence he felt the air around him grow cold.