Although his carvings were considered that of a rare talent, his Buddha statues were rejected by a local temple for not having any soul to them (which greatly frustrated Junkei). One day, his little sister (who often assisted him) was ruthlessly killed by a samurai for merely bumping into him.
Junkei was driven mad with grief and began a brutal murder spree of samurai, driving his chisel directly into the heart of his sister's killer with his hammer and going after others in a hope of dealing with his emotions. Nothing seemed to work and when the priest who had rejected his statues returned, he recommended that Junkei turn his anger to benevolence instead.
Junkei was sentenced to death for his crimes and spent his last three days alone in a cell awaiting his execution. After he was executed, a jailer sought out the priest and revealed Junkei had spent his final days carving a beautiful statue with the materials in his cell. The statue reflected the love he had for his sister and the priest gladly accepted it and had it brought to his temple.
A few generations later, the statue served as the conduit for Senju Kannon to be able to enter the human realm. His spirit was later consulted through Anna Kyoyama when the Senju's armor had broken and he needed it repaired and he gladly accepted (at first mistaking Senju for his little sister).