The Astonishing Colour of After by Emily X.R. Pan

When Leigh's mother dies by suicide she leaves only a scribbled note - I want you to remember.

Leigh doesn't understand its meaning and wishes she could turn to her best friend, Axel - if only she hadn't kissed him and changed everything between them.

Guided by a mysterious red bird, Leigh travels to Taiwan to meet her grandparents for the first time. There, Leigh retreats into art and memories, where colours collide, the rules of reality are broken and the ghosts of the past refuse to rest …

But Leigh is determined to unlock her family's secrets.

To remember.
 
- Goodreads Summary