Hiru

One of the 12 Saijō Ō Wazamono grade swords.

Roja finds it at the DonQuixote family's underworld auction in West Blue.

It's a bright white, named Hiru which translates to day, its the opposite of Mihawk's Yoru, which translates to night.

It is Roja's sword up until he enters the 5th stage of soul sword, as it breaks from a strike from sword grandmaster Koushirou's Saijō Ō Wazamono blood sword Ming.