The Holy Sol Temple (聖陽教会, Seiyō Kyōkai) is a church where Sisters and Priests worship the Sun God. Following the outbreak of Spontaneous Human Combustion, it became one of the three organisations that formed the Special Fire Brigade and as such, the 1st Special Fire Brigade is vastly composed of members from the organisation. Due to the Tokyo Empire's belief that only the Holy Sol Temple can provide medicine, the medically focused Special Fire Force Company 6 is also one of the Temple's constituents.
The original church was a wide brick-built construction that resembles an old-fashioned church. On one side was a large tower, while the rest of the construction is one large sector. There was multiple windows spread out across the church. Outside the church seems to be a rural area with trees and windmills.
Some time after Hibana and Iris joined, the church they lived in caught fire and incinerated all the sisters except for the pair as the result of Spontaneous Human Combustion. The two surviving sisters fled.
In Year 198, the priest of The Holy Sol Temple and two other church members attended the Rookie Fire Soldier Games, alongside other important figures.
- The known names of sisters who have attended The Holy Sol Temple are all based around flowers.