Gundam Build Divers

Gundam Build Divers is an anime series that aired in 2018 as part of the Gundam franchise.

A spiritual successor to Gundam Build Fighters, Gunpla Battle Nexus Online (GBN) is a new game that lets people battle each other using Gunpla in a virtual cyberspace dimension. Middle school students Riku Mikami and Yukio Hidaka recruit their classmate Momoka Yashiro and start playing together in GBN, where they meet a mysterious girl named Sarah who has an amazing sensitivity to Gunpla.

OP
Riku briefly appears naked.

Episode 1
Riku appears naked as he logs into GBN for the first time.

Episode 18
Riku wears a swimsuit.