lovers

hello..iam searching for manga that have synopsis like this (his crush still love someone else(their childhood friend=literally his friend to and that friend died in accident when they kids) they found a hole that can bring them back to the past. they went back together to prevent that accident but cannot in exchange that boy die. can you please help me??? i want it so badly..huhu.. tq...(▰˘◡˘▰)