This is a story of an organization called B-Kikan made up of Jittoku, Nemu, and their boss. They help fight against Insects, parasitic organisms made by the government that feed on human bodies for nutrients.

Marshmellow is the head of a gang of thieves known as Mitsukubi Condor, and he is obsessed with beauty. One day, a girl named Cocoa comes to him, trying to find the harp that was precious to her village. He decides to help her recover the valuable harp, which plays beautiful music that can draw out rainbows!

(Source: MangaHelpers)

Included one-shots:
Volume 1: Ymir no Majin
Volume 2: Parasite B
Volume 3: Mitsukubi Condor (pilot)

This story is about a boy named Rokumichi Kusaba who wants to confess his feelings to Yayoi Hino, his childhood friend. Unfortunately, after choosing the place to confess, he gets crushed by a train and loses his lower half. Rokumichi then gets saved by a scientist that turns him into a monster instead of a regular human being. How is his life going to be like under the guise of being a monster? And what would his childhood friend think?!

After a ten year long war broke out, there were displaced soldiers called Rabi who can manipulate and create golems for the sake of battle. Many turned to becoming bandits, but there was one man among them who chose to fight against fellow Rabi. His name is Humpty, and this is his story.

(Source: Batoto)