Conversation so far:
How did Sugizo's solo career begin?
After Luna Sea went on break in 1997, Sugizo started his own solo career and opened the independent label Cross to produce other artists and release his own records.
What did Sugizo first accomplish on his solo career?
On July 9 1997, Sugizo's debut single Lucifer was released and reached number 8 on the Oricon singles chart.

Question: What did Sugizo do on July 9th?
Self-contained rewrite: What did Sugizo do on July 9th?