The Alnwick Poison Garden is pretty much what you’d think it is: a garden full of plants that can kill you (among many other things). Some of the plants are so dangerous that they have to be kept behind bars. [x]
The Servant of Evil is a story from the point of view of Hiroshi Kagamine. Hiroshi is in an area in which he is forced to trust very few people, only those in his alliance, including his closest friend, Rintomu Joukawa and Yukie Neru.
After discovering his feelings, along with a misinterpreted message from Rintomu, Hiroshi goes to eliminate the one he thinks is in the way of them achieving their goals; King Hatsune. Hiroshi murders King, and leaves him for dead.
Meanwhile, the Painter of Blue, Atsuko Shion, seeks vengeance, having loved King with a burning passion. She teams up with the warrior of red, Meitsuo Shinone to take down the murderer of King.
Rintomu, knowing that Hiroshi was the real culprit, tried his best to defend his closest friend by stashing evidence; but alas, it was all in vain. Rintomu has no choice but to allow Hiroshi to be executed for his deeds. Hiroshi had wanted this, and after a vote for his best friend came in, potentially making him the target, Hiroshi would have given himself up anyway, although, that is speculation.
There is also the story of the daughter of lies, Yowane Setsuko, who lost her best friend at the same time, and wanted to seek vengeance, but was stopped, but, that is a tale for another day