To All the Boys I've Loved Before: The Graphic Novel by Jenny Han

Lara Jean, who writes secret love letters to all her past crushes. Her life is upended when these private letters are accidentally mailed out to all the recipients. 

This book contains: adolescent romance, alcohol (mentioned), alternate gender/sexual ideologies (mentioned), anxiety, profanity (mild), birth control (mentioned), sexual activities (not explicit), sexual dialogue, and sexually explicit literature.