|This article is about a/an character in Samurai Sentai Shinkenger.|
Shinza was the man who Usuyuki (薄雪) was obsessed with. Scorned that he loved another woman instead of her, Usuyuki set fire to the building holding his wedding ceremony, killing him, his bride, and the entirety of their wedding party, in a suicidal crime of passion. Seeing that her love would remain unrequited to the bitter end, Usuyuki's emotions corrupted her soul and caused her rebirth into Dayu Usukawa. The transformation also forcefully bonded Shinza's soul into the shamisen that Dayu carries with her, creating the eerie and unsettling songs that serve to soothe Dokoku's rage. The shamisen's headstock also doubles as the hilt of a shortsword Dayu uses in battle.