Soul Eater, Vol. 12 continues where the previous tankōbon left off and contains the next four chapters (45–48) of the on-going manga series.
Medusa offers to lead a strike team into Baba Yaga's castle, Arachne's headquarters, and gives Shinigami the real Brew as a sign of good faith. Shinigami agrees and Maka Albarn, Death the Kid, Ox Ford, and Kilik Rung are assigned to the team. With Medusa's aid, the team manages to evade the perimeter defenses around Baba Yaga's castle and they successfully infiltrate it.
Medusa explains that there are eight locks to Arachne's throne room, and that the group will have to separate to destroy them. Ox Ford attempts to search for Kim Diehl, whom he has feelings for, in the castle. He finds her manipulated by a machine that lowers morality, and she stabs him, claiming her allegiance is to Arachnophobia.
The alarms in Baba Yaga's castle begin to activate as Black Star arrives, running straight through all the perimeter's defenses.
This tankōbon is written and illustrated by Atsushi Ōkubo. It centers mainly on the mission to infiltrate Baba Yaga's castle – the headquarters for Arachnophobia. A small group, with the help of Medusa, makes it in the castle and circumnavigates the defense perimeters, but it was for not as Black Star arrives and runs through all the defenses – alerting Arachne.
All in all, Soul Eater, Vol. 12 is a wonderful continuation to a series that seems really intriguing and I can't wait to read more.