Basically, some humans have the ability to negate a sphere of reality, neatly removing it from existence. This gradually alters their appearance until they become a hideous alien, with a giant eye in their forehead.
Source: M-U
The Country of Tanabata has finished publishing and it has 28 Chapters. It is also Known as: Tanabata no Kuni
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3. Pupa
The "life-and-death sibling" story follows Utsutsu and Yume Hasegawa, a boy and his little sister who find themselves all alone. One day, Yume sees a mysterious red butterfly and her body undergoes a strange metamorphosis—into a creature that eats humans. Utsutsu struggles to find a way to restore his sister.
has finished publishing and it has 34 Chapters. It is also Known as: pupa, Pupa
2. Tajikarao
From Blackout:
Yamagami is a small hamlet in Kyuushuu, the mountainous region in the south of Japan. Today, this village is inhabited only by old people still living in the rhythm of tradition and communion with nature. The return of one of the village youths, pursued by yakuza, will overturn life in this little world, spared until now from modernization. These sinister gangsters intend to seize this enchanted spot and trash it. Will Yamagami come to experience the harshness of the modern world?
has finished publishing and it has 43 Chapters. It is also Known as: たぢからお, Tajikarao
1. Kiseijuu
They arrive in silence and darkness. They descend from the skies. They have a hunger for human flesh. They are everywhere. They are parasites, alien creatures who must invade–and take control of–a human host to survive. And once they have infected their victims, they can assume any deadly form they choose: monsters with giant teeth, winged demons, creatures with blades for hands. But most have chosen to conceal their lethal purpose behind ordinary human faces. So no one knows their secret–except an ordinary high school student. Shin is battling for control of his own body against an alien parasite, but can he find a way to warn humanity of the horrors to come?
Parasyte has finished publishing and it has 64 Chapters. It is also Known as: 寄生獣, Parasite, Parasitic Beasts