It's burial

Marikofun's first Kofun album in 3 years
Following her 1st album "Kofun de Kofun!" and 2nd album "Decorated Kofun," this is the third kofun-themed song album from kofun singer Marikofun, released after a three-year hiatus.
The album includes "Kofun Collection," which depicts her feelings towards kofun designers, "Kitora Forever... Continued," a sequel to "Kitora Forever..." from her 1st album, and "It's Burial," which depicts the process from choosing the location of a kofun to burial from the perspective of a kofun builder. Marikofun interprets kofun from her unique perspective and sings about them in a variety of genres.