Chiron (Ashton Sanders)'s mother Paula (Naomie Harris) is addicted to drugs and has no intention of taking care of her children. Chiron grew up in loneliness and was often bullied and teased by those around him because of his thin body. By chance, Chiron met drug dealer Juan (Mahershala Ali), and since then, Juan and his girlfriend Theresa (Janelle Monae) have become Chiron's second home. Kevin (Jharrel Jerome) is Chiron's only friend. Over time, the relationship between the two has gradually surpassed friendship. However, in order to hide his sexual orientation, Kevin had to fight Chiron at the instigation of his companions, and the two never met again. In a blink of an eye, many years have passed, and Chiron suddenly received a call from Kevin, and the two finally decided to face up to their true feelings in their hearts.