OVA
Description
Mai Amatsu is one of the two title characters from the original Twin Angels anime, appearing alongside her older twin sister, Ai Amatsu. As the younger of the two sisters, Mai is characterized by her short hair, which distinguishes her from Ai who has a long ponytail. Both sisters are students at Tenjin Girls High School and serve as the latest in a long line of legendary female warriors and virgin priestesses. Their sacred duty is to guard a young half-demon named Onimaru, a distant relative of the sisters. Onimaru stands at a critical juncture in his demonic evolution where he has the potential to become either a great warrior of light or the next Demon King, a choice that would plunge the world into an era of debauchery and evil.

The Amatsu sisters are descendants of an Angel from Buddhist tradition who was forced to marry a fisherman after he stole her heavenly robes. The original Angel gave birth to twin girls and a younger brother. That younger brother was later betrayed by the Japanese government, and his spirit now seeks revenge by attempting to corrupt Onimaru into becoming a sexually depraved demon king. This familial curse is the burden that Mai and Ai inherit. They are supported in their mission by their grandmother, Genjuu Amatsu, as well as Onimaru's guardian, a figure named Dekonobu.

Mai's primary role in the story is as a protector and a warrior against the forces of darkness. She and her sister must constantly battle demonic minions who seek to capture Onimaru for their own purposes, all while keeping the young half-demon from succumbing to his own dark potential. Her key relationships are central to the narrative, most notably the close bond she shares with her twin sister Ai, as they fight together as a team. She also has a complicated dynamic with Onimaru, who becomes quite taken with the sisters and follows them, sometimes frustrating their efforts to protect him. The story provides limited specific detail on Mai's individual personality or character development separate from her sister, as the two are often presented as a pair fulfilling a shared destiny. Information regarding notable individual abilities unique to Mai, beyond the standard warrior skills common to the Amatsu line of guardians, is not available.