Tsuki (Moon) is Kongō no Shū's (Kento of Hardrock) CD drama. It arrived much later in production (during the time that the Message OVA was released) compared to the other dramas. And unlike the others, Tsuki features the three remaining Mashō (Dark Warlords). The new opponent is named Gōgasha, a demon who has an eye for being the new leader of the Four Mashō, something that Anubis (Cale), Rajura (Dais), and Naaza (Sekhmet) do not approve of.
Tsuki takes place right after the episodes that involve Ryo using the Kikōtei against Saranbo, their latest enemy. The Troopers contemplate the possibility of Arago's return and Shū wishes for them to visit his family's restaurant in Yokohama. However, the others think it would be a waste of time and ultimately hurt his feelings.
Later in the evening, Shū is late meeting up with the others. Gōgasha makes his appearance and proves to be a powerful opponent. As the Troopers struggle, Shū arrives on the scene and summons his armor. He proves to be more than enough for the demon and defeats him. Back in the Yōjakai, the three Mashō are actually grateful for Gōgasha's defeat. Fans learn of the respect the Mashō actually have for Shutendōji (Anubis) and how nobody can take his place, despite their differences.
Read more about this topic: Samurai Troopers (Ronin Warriors) CD Dramas