Yaoi

Being able to see into people's past has no real appeal for the teenager this story is about, letting him use it only as amusement and to show off when he was drunk.
    Never watch into someone's past beyond a superficial level.
    Never try to find out more than you should.
    NEVER. EVER. LOOK. INTO. THE. FUTURE.
    But everything changed the moment he was forced to look into the future, was forced to investigate a murder, and was forced to make the acquaintance of the victim's twin brother('s fists).
    The more time passed, the more it appeared that the primary reason for this murder wasn't a local problem, but a global one.
    This single, marred corpse was the beginning of a threat that would shake the world.
    (MC looses a screw when he enters the prison)
    BL, first-person view; MC is shuo (perhaps even a reversible couple); love interest falls in love first; both MC and ML are straight, mutual bending, Enemies to Lovers