Masamune Shinmei

Masamune Shinmei is a member of the Giou Clan and is a necromancer in training. He is under the apprenticeship of Tsubaki Shikibe.

He is currently in charge of protecting the Evil Spirit Gates while also studying necromancy at the Kamakura residence.

Background
His father, Suzaku, was a necromancer and the one responsible for causing the tragedy at the Garan house, which killed Senshirou Furuori's grandfather and a number of other Giou clan members, as he was the one to summon Cadenza.

Although Masamune lived together with Kuroto and Senshirou in Kamakura, they never took it out against him nor did they even mention it in front of him.

After the tragedy, Masamune's family was expelled from the Clan, leaving his mother,  Kayako, to take care of him and his younger brother on her own. She apparently overworked herself and broke down, making her last resort to throw out her children and have them beg the Giou Clan for help.

Masamune ended up doing this as was taking in by Takashiro, who offered him the chance to become a necromancer. If he was willing to do so then Takashiro promised to protect him and his family. Masamune agreed to this.

Two Souls
It is revealed in Story 60 that Masamune has two souls, his own and that of his father's, Suzaku.

Masamune is taken over by Suzaku after Kayako is revealed to be the murderer and Yuki kills her.