You rescued the mirror seller, only for him to venture deeper in in search of the key to the Keyhole Centre? I hope he makes it out before the malice grows even stronger.
あんた、鏡屋、助けたのか?あいつは鍵穴中心の鍵を探しに行ったんだろ…また邪気が強くなってくる前に、出てこられるといいがな。
101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin
Home › Items › Keyhole Centre Key

Keyhole Centre Key is item 16 of the game's item table, in the Items group. The script names it on disc 1.
Lines of the script that name it, each with a link to its place in the script.
You rescued the mirror seller, only for him to venture deeper in in search of the key to the Keyhole Centre? I hope he makes it out before the malice grows even stronger.
あんた、鏡屋、助けたのか?あいつは鍵穴中心の鍵を探しに行ったんだろ…また邪気が強くなってくる前に、出てこられるといいがな。
Keyhole Centre Key acquired.
「鍵穴中心の鍵」を入手しました。
Item table: Supreme Magnet Keyhole Centre Key Compass Doll
English translations by Cargodin for Hilltop Works Fan Translation Patch: https://www.patreon.com/hilltopworks/posts/kowloons-gate-160555525?collection=18503