Kazaana

\[S Division], a separate division created within the Tokyo Metropolitan Police Department investigates crimes impossible to explain with science, and with links to mysterious creatures.

When he woke up, he was in a room he didn't recognize. A little girl, Lulu, called him "Big Brother." "We're all here, I'll go get Dad!" Then Lulu left the room with a bright smile. He didn't know where he was. And he didn't have a sister. In an instant, the door opened. Something came with a rattling sound. Something called "Dad" entered the living room. A high concentration of mystery and fear is chained together in this crazy situational thriller. If you read this, you will be part of our "family" from today.

Enjou Shuuto’s dream was always to become a detective and take down the scumbag who killed his father. As practice, he takes on the local bullies at every opportunity… only to get his butt handed to him. But what happens when rogue nanobots descend on his neighborhood, “enhancing” their hosts with deadly results? Source: MANGA Plus