Masahiro is the protagonist in the series. He is an Onmyōji in training and the grandson of the legendary Abe no Seimei. When he was young, Masahiro’s spiritual sight was so strong that Seimei temporarily sealed it away until he was old enough to properly use it. After meeting Mokkun, Masahiro regained his spirit sight and embraced his destiny as an Onmyōji in service to the emperor.

He is friendly and kind to both yōkai and people whom he seeks to protect from evil demons that had taken up residence surrounding the imperial capital. Although he is sometimes cocky and clumsy, there are moments when he utilizes powers beyond those of a mere apprentice, which is why Seimei claims he is the only one who can succeed him. Masahiro greatly resents being known only as Seimei no Mago (晴明の孫, Seimei's grandson) and trains hard to surpass his grandfather.

He has two older brothers whom both are married and has families of their own. Narachika is the eldest in the family. His second older brother, Masachika is ten years older than he is.

According to Ten’itsu, children in the Abe residence were often taken care by the twelve Shinshō. It was seen through flashbacks in the anime that Masahiro was taken care by Guren.

In addition to his magic, Masahiro later receives a sword called the Gōma no Tsurugi, a sword which was forged by Seimei which previously belonged to Suzaku. He was also given Kagutsuchi (軻遇突智) by Takao no Kami, flames that has the power to kill gods, in order to destroy the corrupted Guren.

In addition, he erased Guren’s memories that are about him, meaning that Guren will never remember the time when he met Masahiro in the form of a mononoke or the time when they were fighting demons together.

He cares a lot about his friends, his family and his love, Fujiwara no Akiko whom he vows to protect no matter what.

(Source: Wikipedia)