Kiyonori Yakumo

Birthday: March 14th
Blood type: A
Height: 182 cm (5'11")

The boyfriend of Hina Saotome. He is a source of emotional support for Hina, who is alone after losing her parents, and they are engaged. He has short grey hair, wears glasses, and has a gentle and kind personality.

He attempts to help her escape before their plans are foiled by Aki Myoujin. The guards become even stricter on her, and he is no longer able to see her. Later, Yamato begins to suspect that he may be betraying Hina.

In fact, he has had a rare talent for developing weapons since he was a child, but he has hidden his talent for a long time, not being recognized by those around him, and has been wasting it.

(Source: Mangapedia)