Looks like another promising work from Sachimo! The angst I strong with this one.
MC is completely unlucky, and those who have meaning to him die around him. His step brother is the only person he has left, so our MC has a bit of brother complex. The MC is saved by a stranger in the train, and later runs into him again multiple times. Their personalities don't really match, but these encounters must happen for a reason...
Hate, hate, hate