Natsunokumo

Natsunokumo (ナツノクモ) is a seinen manga series by Rokuro Shinofusa. It was serialized in Ikki.

Plot
Coil is a man whose idea of "life" is his alter ego in an online world. A place where the hearts of people come together...and it is not a pretty place. The slender spiderweb that connects their souls within this endless world brings greater pain than reality itself.