sentences:  Although praised Papillon's backhistory, Mania's Chris Beveridge criticized his design and called him "a very quirky and weird character".Conversely, Patti Martinson wrote for Sequential Tart that the characters "are distinctive and interesting", and "The Star" reviewer called the character "Buso Renkin"s "saving grace".Kazuki was said to be a "very likeable hero" by Active Anime's Holly Ellingwood, who also stated Papillon is the "most memorable" villain of the series.