Retsujitsu refers to bright sunlight on a summer day. This is an apt temperament for Utsuho, who is a vessel for Yatagarasu, the avatar of the Sun. Utsuho is endowed with Fire Phase, as a Hell raven, and Sun Essence, as a vessel for Yatagarasu. The formless and passionate Fire Phase resists Wood Phase, because wood feeds fire, but it is weak to Water Phase, because water dampens fire. The alluring and arrogant Sun Essence resists the diverse and uncooperative Star Essence, but it is weak to the cooperative and indecisive Moon Essence.

Utsuho Reiuji's ability as a vessel for the divine spirit Yatagarasu. As the name suggests, she can control nuclear fusion. It is an immeasurably powerful ability. It is no exaggeration to say that the generation of stable energy through nuclear fusion reactions would be the greatest theses of physical science. Nuclear fusion is sought after as it would be a much more efficient and clean source of energy. At the same time, prospects for making it a reality with current technology are not bright. But it is often featured in sci-fi stories as a fantastical source of energy. The reason Utsuho can control such power on her own is because she has Yatagarasu, the Sun God Amaterasu's envoy and avatar for sunspots inside of her. Nuclear fusion is the power of the sun and an ultimate aspiration of mankind, so who could have possibly given her Yatagarasu? ...Gods with an interest in scientific engineering and devoted to gaining control of faith are to blame. Because Utsuho is pure and straightforward, she isn't likely to abuse such power. If she had been wiser, then the incident involving vengeful spirits emerging from geysers on the surface world may have gotten more complicated. It's not clear whether these gods (who live atop a mountain) took this into account, but as a result, Utsuho's friend Rin had to rush to and fro to try and resolve the problem. That's proof of Utsuho's character. She is guilty of no sin... probably.