Odc. 4: Tetsusaiga Inuyashy zyskuje zdolność pochłaniania demonów po śmierci kowala Toshu

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Inuyasha's group rescues a swordsmith named Toshu from the demon Ryujin, who is after Toshu's Dakki, a sword designed to absorb demonic energy. After Ryujin is injured by Inuyasha, Toshu stabs him with this sword, taking away his demonic energy to complete the blade. However, Toshu then attempts to steal Tetsusaiga's demonic energy, though this slowly begins to turn Toshu into a demon. The demonic energy proves to be too powerful for Dakki, as it transfers its damage of absorption into Toshu, thereby killing him. After Dakki breaks and releases its power, Tetsusaiga gains Dakki's ability to absorb demonic energy. Meanwhile, Naraku's latest incarnation, Byakuya, has ordered a young wolf demon to retrieve Koga's shards in exchange for his younger brother, Shinta. The youth brings Koga to Byakuya, who proceeds to send Shinta away with a moth demon. Moryomaru catches it and almost absorbs Shinta. However, while Shinta is rescued, Moryomaru gets the older brother's shard. Inuyasha's arrival with his new dragon-scaled Tetsusaiga reluctantly allows Moryomaru to absorb the Adamant Spears, but the overwhelming power forces Moryomaru to flee. However, Tetsusaiga begins to backfire, leaving Inuyasha wounded and bewildered. Byakuya reports back to Naraku, who ponders whether Tetsusaiga would defeat its opponent or destroy its owner. (Source: Wikipedia)