KONO Tsuranori 
D-Genesis: Three Years after the Dungeons Appeared Volume 8 [EPUB ebook] 

It’s Keigo and Miyoshi versus the King of the Woods! The sports, arts, and music worlds grapple with the impact of dungeon training. Keigo and Miyoshi finally make contact with two members of the World Dungeon Agency’s Food Research Division, eager for some granular discussion about certain dungeon produce.

Meanwhile, the oranges D-Powers brought back from the twenty-first floor catch the eye of Sayama, a researcher with no dungeon experience. When Sayama earns the ire of a powerful boss after snapping a certain tree branch, D-Powers will have to find a way for him to defeat the monster while they protect Kei’s identity. It might involve a little help from the JSDF, and that most powerful of all acronyms—“NDA.”