"The OneeChanbara" series puts players in control of a lone girl (or in later games, two girls with the ability to tag out) against a legion of the undead. Players guide their characters through the stages, completing tasks while hacking through enemies. The player-character's weapon becomes progressively covered in blood, causing their attacks to be slower and to inflict less damage, even getting stuck in enemies if it gets too bad. This is represented by a "Blood Meter" showing how dirty the weapon is. To prevent this, players must actively clean off their sword to keep the blood meter from filling up.