I "Dirty Grandpa" spiller Zac Efron den dydige Jason Kelly, der snart skal giftes med den perfekte, kedelige kæreste. Det vil Robert De Niros liderbuks og eks-general med det passende navn Dick Kelly sætte en stopper for med et vildt roadtrip, der byder på dejlige damer og hårde stoffer.
Ichijou Souta is an office worker in a financial office, hardworking, capable and good looking. However, he has a hobby that most people don't know about - he likes to eat completely naked! For him, enjoying food in the buff is a good way to relieve his stress. One day, he receives a letter from his grandmother and goes back to his hometown, but he didn't expect that his secret would be accidentally discovered by Mahiro Miki, a local boy who runs a fruit and vegetable store! Is it game over for Souta? What will his next decision lead him to?
