A Ghostly Trail

Lei-Rin, Lei for short, has the unique ability to see ghosts. He can follow their ghostly trails, which is a trail left behind in life. He cant follow living people's trails, but when he comes across a strangly green trail, for all trails are blue, he realizes its a living persons trail, left by a spirit. a spirit leaving a live trail is unheard of! for days he ignores it, but it appears to be following him. so he follows it and is led to triplet spirits who beg for help.