On the Verge of Lunacy

While listening to music, Izumi Shinichi feels a strange creature creep up his hands. It seems like a worm has burrowed in his hand and is creeping slowly up his arms. With seconds only to spare and no idea what to do, Shinichi coils the cord of his headphones around his arm to stop the worm from getting further. To his horror, the worm took over that arm when it failed. The creature which he later called Migi, has eaten part of that hand and is partly attached to Shinichi's body, the latter being its host. Migi reveals that he originally planned to enter Shinichi's ear and take over his brain. Failing that, he settled in taking over the right arm. Migi seems like an intelligent creature and gradually the two got along just fine, except when the matters turn to the issue of parasytes feeding on humans. The two will need to work together however as it seems that they are always targeted by other parasytes. Migi and Shinichi in their first few days togethe...