Gargoyle's first live album. It contains one song selected from each of their 21 performances during their nationwide "pre-tournament21" tour. It also features songs previously unreleased by this point, including "Genom" and "the wall."

As is common in this band's history, the album title is also a wordplay. "Huin", which means "Seal" in Japanese, is pronounced very similar to the English within tildes.