Vol. 1: Kirei (2016) Vol. 2: Matsuri (2017)

Japan has yet to become one unified country. A sudden cease-fire prevails in the fighting between the Yamato Imperial Court and the native Emishi people over Japan's northeastern Tohoku region. An Imperial Court envoy visits Aterui, the chief of a great Emishi tribe. The envoy who calls himself Sanekage proclaims, "Let's go on a journey to hunt a demon together." A demon created by a shōmoji entertainer in the Imperial Court had suddenly started attacking people indiscriminately. Aterui had no reason to lend a hand to his careless enemies, but he decides to embark on this journey due to Sanekage's offer related to revenge for Aterui's wife. (Source: Anime News Network) *Note: Includes 3 extra chapters.*

Corporate slave goes to another world, creates a restaurant in a dungeon, then gets hailed as history's strongest demon king as a result. Source: MU

Originally published in the Shounen Club Magazine of July 1934, page 158.

Alice is engaged to Reiji, the executive secretary of the Cunningham Hotel Tokyo. She always tells him how much she loves him, but he still treats her coldly. He teases her with passionate kisses, and she can't resist begging him for more....... "The more you cry out, the better you'll feel." With a confident, sexy smile, he caresses her lewdly, making her feel like she's about to drown in pleasure. An eager and devoted young lady is loved by a mature man, and this is her doting diary until their marriage! (Source: Printemps Shuppan, translated)

Ganqiao is a wandering vagabond. When Zhengli is attacked by mysterious monsters, he tries to help her, and Zengli gives him her father's mysterious henshin belt. When Ganqiao put it on, he is transformed into Kaman Rider 555 and defeats the monsters. That is the start of their adventure together. (Source: YesAsia, translated)