"Swinging Back into Action", known as "Junior Youth Championship"in the Japanese version, is the one hundred and forty-first episode of the Yu-Gi-Oh! ARC-V anime. It first aired in Japan on February 5, 2017 and in Australia on April 8, 2018. It became available with official subtitles via Crunchyroll on February 13, 2018.
As Yuya spends his days in peace, he receives a notice about the Junior Arc League Championship. When Yuya arrives to the stadium, Declan tells him the details about the championship. Declan invited Yuya, Gong, and Sylvio to the Junior Arc League Championship, where fierce battles will unfold. Just what on earth is Declan's true motive…!?
Turn 4: Moon Shadow Moon Shadow activates "Twilight Ninja Jogen" ( 1) and "Twilight Ninja Kagen" ( 10) in his Pendulum Zones. He Pendulum Summons "Twilight Ninja Shingetsu" (1500/100) and "Twilight Ninja Getsuga, the Shogun" (2000/3000), both in Attack Position. As he controls a "Ninja" monster, Moon Shadow activates the Continuous Spell Card, "Illusion Ninjitsu Art of Hazy Shuriken". Whenever a card is added to his hand, Moon Shadow may send that card to the Graveyard to inflict 300 damage to his opponent. If he does not control a "Ninja" monster, "Hazy Shuriken" will destroy itself. "Shingetsu" attacks a "Hippo Token". Yuya finds the Action Card "Flame Ball", but Moon Shadow takes it. He sends it to the Graveyard to activate the effect of "Hazy Shuriken", inflicting 300 damage to Yuya (Yuya: 4000 → 3700 LP). Moon Shadow activates the effect of "Jogen", allowing him to let a "Ninja" monster he controls inflict piercingbattle damage this turn. He targets "Shingetsu". The attack continues and "Shingetsu" destroys the "Hippo Token". (Yuya: 3700 → 2200 LP). Moon Shadow activates the Pendulum effect of "Kagen", which allows it to copy the original Pendulum effect of a Pendulum monster in his other Pendulum Zone until the end of the turn. Via this effect, "Kagen" copies the Pendulum effect of "Jogen", allowing Moon Shadow to let "Getsuga" inflict piercing damage this turn. "Getsuga" attacks the last "Hippo Token", with Moon Shadow activating the other Pendulum effect of "Kagen", which increases the ATK of a "Ninja" monster by 500 until the end of the Battle Phase when it attacks ("Getsuga": 2000 → 2500 ATK).