Gokokuzan Tokoji Temple is an Obaku Zen temple founded by Egyoku, a renowned priest from Hagi, in 1691 with the patronage of the 3rd lord of the Choshu domain, Mori Yoshinari. Together with Daishoin Temple, it had been a family temple of the successive lords of the domain.

The two-floor, two-story Sanmon Gate, or also called Gedatsumon (Nirvana Gate), is worth seeing. It was dedicated by the 10th lord Narihiro in 1812. The gate is in Irimoya style with hongawarabuki (with formal tiles), atop of which has hoju (a ball-shaped ornament) with roban (the box-like base structure) for lightening protection. The gate is made of zelkova lumbers, which are joined together without nails. The statues of Birushana Buddha and 18 Rakans are housed on the 2nd floor. The gate as a whole is in almost perfect accordance with the Chinese architectural style.

The temple buildings in the Obaku Zen architectural style are laid out to represent a dragon. The temple is known for possessing a lot of historic treasures, which include Japanese painting by the Unkoku school artists and wooden plaques of mokugaku (a prefecturally designated Tangible Cultural Property), churen, and bohai. In the precinct are the graves of the eleven brave Sonno Joi extremists who were executed in the prison in Hagi and those of Kinno warriors who worked to establish a return of imperial rule. In A lot of people visit the temple for Mantoe (the lantern festival) held in August at the two family temples of the Mori clan, Daishoin Temple and Tokoji Temple, where the illuminated stone lanterns create a mysterious atmosphere.