Episode 6 (K Return of Kings)

Keeper, is the sixth episode of the K Return of Kings anime. It premiered on November 6, 2015.

Yashiro Isana gathers SCEPTER 4 and HOMRA to inform them about the Green King's past and his ambition to release the Dresden Slate's power to the world. Realizing that war is inevitable, the three clans prepare themselves for the coming battle against the Green Clan.

Summary
Nagare Hisui and Green Clan have decided to attack Mishashira Tower to take the Dresden Slate. The three clans alliance also start their countermeasures against them with Yashiro Isana as the strategist. As Nagare only has a limited amount of time to fight, Yukari Mishakuji and Sukuna Gojo act as vanguards to open up the path for him.

The alliance of the Silver, Blue, and Red Clansmen begin to cooperate willingly, starting to defend Mihashira Tower from the Green Clansmen on Christmas Eve. On the start of the attack, Sukuna and Yukari infiltrate the front lobby, disabling the security cameras and pushing back Scepter 4 clansmen, however their duty is to act as bait to split up the two, Yashiro, Neko, and Kuroh to fight Yukari, and the combined forces of HOMRA and Scepter 4 to overcome Sukuna. Instead, Yukari ends up being trapped by the forces of HOMRA and Scepter 4, while Sukuna to fight the Silver Clan.

Nagare and Tenkei Iwafune stand by at the front lobby, debating whether Nagare should charge in with three kings up on the higher levels. Nagare persists that he will go anyways, despite Tenkei's warnings. Tenkei embraces Nagare's plan. Nagare concludes that the alliance is formidable, but not enough for him. Nagare stands up and breaks the steel straitjacket and rushes off into the distance. Tenkei's last quote is "Well, go and have a blast."