please this is my last hope

im looking for a manga about a boy and a girl who like old school/ old fashion things

the only thing i remember is a scene wherfe the girl goes to a karaoke bar and sing a old school song and dress up just like an idol

i've been trying to find it for almost a month now and still no luck

Is it Slow Motion wo Mou Ichido ?

FREAKIN YES THANK YOU OH MY GOD

thanks im really glad