It's a Beautiful Day Anime Details and Episodes The one-shot tells a story about the late Kenji Endō, the real-life musician that was the inspiration for Kenji from 20th Century Boys! Series info Watch free DetailsFormatOne shotStatusFinishedScore54/100SourceOriginalCountryJapan GenresSlice of Life TagsBandNudityMale ProtagonistSeinenPrimarily Adult CastPrimarily Male Cast RelatedKushami: Urasawa Naoki Tanpenshuu (Related) Recommendations20 Seiki ShounenBokura no IbashoOyaji Shuu