石鹸屋 (Sekken-ya, lit. Soap Shop) is a musical group that specializes in rock and punk style live band music. They're also well known as participants in the Flowering Night events, and served as the backing band for live performances of well-known ビートまりお (beatMario) works such as Help Me, ERINNNNNNN!!! The band members are hellnian, 秀三 (Shuzo), 厚志 (Atsushi), and BOSS. イノ (Ino) was the bassist originally, but left in 2007 for personal reasons, and was replaced with イガラシ (Igarashi). Igarashi left in 2010, and since, Ino had returned to the group.

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