待望のゴールデンウイーク。こずえが泊りこみで鍵屋を手伝いに来たところ、疎遠なはずの淀川の弟・多喜次が現れ、なぜか彼も泊まることに。翌日、淀川宛に謎めいた依頼が入り、三人は急遽『鍵屋敷』へ向かう。そこには老婦人・皐により、実力派の若手鍵師が集められていた。そして、屋敷中の鍵を開けてコインを集め、その数を競うという奇妙なゲームが始まって…?
5 卷
第 1 卷
2015-01-20
第 2 卷
2015-06-25
第 3 卷 · 本卷
2016-01-20
第 4 卷
2016-08-19
第 5 卷
2017-01-20
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