Thank Yaoi For Existing

Sup cool people write down the fav users on Mangago ( if u write is me i know yo liar liar pants on fire ) its not have to be popular ones but ima write mine is Aznthiccy ( go follow her or ima shoot u online ) next is my good friend Wat chu doin here also follow plez and all of my friend u can go to my homepage to follow those ppl they are awesome yall so YOU BETTER DO IT

probably not the best description in the title but I'm searching for the name of a manga I read a couple of months ago, about two school boys who play the game walking home from school where you walk along the line of a road marking and if you step off the line accidently you "die", and they walk past each other on the line every day and fall in love, and in later chapters it goes through their entire lives together.

It was SO CUTE and tear-jerk-y, I really really want to read it again. Anyone know what it was called? ;A;