Wit's manga / #hitman(2)

After witnessing a murder as a boy (13) Chris has had a fascination for covered up murder cases and will even go to crime scenes to investigate for himself. After going to college he seems to meet a like minded man with an interest in crime. But he turns out to actually be the perpetrator of many of the crimes he has researched. They fall in love VERY fast, it's like 0 to 100 in 5 minutes for our uke. Not complete...

Mostly action with some romance sprinkled in. Jack witnesses a murder of two famed bad guys and so goes under witness protection. However, a hit is put on him where a hitman known as D is forced to kill him (though he doesn't like killing innocent people). Even so, D decides he can't go through with the hit and goes on the run with Jack (where they then fall in love~)