Bokura no Yuuki SP

Other name: Miman City , ぼくらの勇気　未満都市　MIMAN CITY 2017

Synopsis:
20 years ago, a promise was made. What type of adults have they become? Did they become who they wanted to be? In 1997, they faced a huge enemy that only young courage could fight against as a weapon; in 2017 they are faced with even more formidable opponents.