Chou Yuu Sekai: Being the Reality
English name: World of Super Sand Box: Being the Reality
Genres: Action, Adventure, Fantasy, Romance
Type: ONA, Episodes: 20
Aired: Jan 12, 2017 to Jun 8, 2017
Studio: Asahi Production, Success Corp.
Source: Web manga
Rating: PG-13 - Teens 13 or older
Synopsis:
A hot-blooded high school teen, a mysterious female swordsman, and an unpredictable dark emo girl. It's impossible to distinguish between reality and the game world! What kind of conspiracy is awaiting them in this super journey of the world!

(Source: MAL News)