[TOMT] A book from middle school

my girlfriend read this book in middle school and cannot remember what it was called

the following is her chatgpt prompt trying to find it

what book has something to do with cicadas and a world where people kill themselves because they have so many lives, and when you die you get reborn with a better quality before but lose a part of yourself every time you do it

it also has a cover with a giant red number onnit

it follows a boy in highschool and everyone has a giant number tattooed on them telling how many lives they have used

the boy has a girl bestfriend

the cicadas would swarm the city and i remember maybe the boy running away from a swarm

i also remember a kid killing himself in front of tons of students and it being gory