The protagonist of the manga "NG LIFE". He is a Japanese high school student with memories of his past self, Sirix.
Keidai Saeki is the main protagonist of the manga NG Life. In his past life, he was a gladiator named Sirix Lucretius Fronto. Keidai os able to remember his past life, and even in his present life, he spends his entire time dwelling in his past.