Not Quite LoveNewKoi to Yobu ni wa Sasayaka desuga

In a twist of fate, high schooler Umi Sayama finds herself moving in with the Hiroi family next door. There’s just one problem—their son, Sho, is her childhood crush, eight years her senior, and it’s been years since she last saw him. Just as she's wondering if seeing him again will be the meet-cute romance that will change her life, she finds out that the honor student that she once admired has been transformed into a scruffy manga artist. Though she can’t quite shake her old feelings, Umi is certain—it’s more than a first crush, but it’s definitely not love.