Episode 15 (Hanyō no Yashahime)

"Farewell Under the Lunar Eclipse" is the fifteenth episode of Hanyō no Yashahime.

Synopsis
What happened to Towa, Setsuna and Moroha's parents, Sesshōmaru and Inuyasha and Kagome... Riku begins to speak. It began 18 years ago, when Hōsenki II delivered a new black pearl to Inuyasha. Four years later, Towa and Setsuna were born. However, when Sesshōmaru takes away the twins, he hides them in a barrier, because there is someone who aims for the lives of twins. The name of the person who hates Hanyō is Zero, Kirinmaru's older sister. It was predicted that it would be beings that are neither human nor demon who would destroy Lord Kirinmaru.

Plot
Riku reveals that 18 years before, he had the Youkai jeweler Hōsenki II to create the Black Rainbow Pearl using Inuyasha's mother's tincture, which contain her tears of grief for her husband's death, and can create a path to his father's resting place. Housenki then gives the pearl and the tincture to Inuyasha and Kagome respectively, with Inuyasha encrusting the Pearl inside his right eye for safekeeping. A few years later, Rin gives birth to Towa and Setsuna. Riku approaches a pregnant Kagome and warns her about the dangers of the dark comet, which was partially destroyed 500 years ago but a fragment of it is about to fall on Earth and asks for Inuyasha and Sesshōmaru to work together to destroy it, while Zero warns Sesshōmaru that Kirinmaru will surely kill his and Inuyasha's children should he know about them.

In response, Sesshōmaru takes the newborn Towa and Setsuna with him. Joka attacks him to kill the babies and Sesshōmaru cuts her arms away, obtaining the Silver and Gold Rainbow Pearls that he gives to his daughters and Jaken declares that he will take care of them and their mother. He uses his Staff of Two Heads to erect a demon shield around the area.

Meeting with his younger half-brother and Kagome at his mother's palace, Sesshōmaru destroys the dark comet fragment with Inuyasha's help, while Zero awakens Kirinmaru and informs him about Towa, Setsuna and Moroha's existence. Fearing a prophecy left by the Shikon Jewel about Kirinmaru being killed by someone who is both Human and Yōkai, Kirinmaru has Sesshōmaru accompany him in order to kill Inuyasha. Inuyasha and Kagome entrust the newborn Moroha and the tincture to Hachiemon and confront the duo. Claiming that Inuyasha's Meido Zangetsuha ability is needed in the future, Sesshōmaru steals the Black Pearl from Inuyasha and seals both him and Kagome inside it instead of killing them.

Four years later, Zero learns where Towa and Setsuna are hidden via the dream-gazing spell and orders Homura to burn down the forest where they live, with Sesshōmaru unable to intervene. Hachi entrusts Moroha to the wolf-demon clan and Riku ends his narration, affirming that he cannot reveal further for now.

Trivia

 * This marks the second flashback narrative and interlude of the anime
 * It is revealed that Riku had once been in possession of the green Rainbow Pearl as well as the blue one; the green Pearl's current possessor is Jyūbei for unknown reasons.
 * Lady Joka's desire for vengeance on Sesshōmaru was due to him slicing off her arms and attaining the gold and silver Rainbow Pearls from her.
 * Shippō and Miroku do not appear in this flashback narrative as they had in the premiere.
 * The time when Inuyasha had given Izayoi's rogue was in Episode 148 in flashbacks of Kaede; its fragments were eventually recovered and reassembled into a new rogue albeit with difficulty
 * It is revealed that powerful mystical pearls are created from the tears of deep sorrow and grief from either humans or demons; the late Lady Izayoi having made the Black Pearl, and Zero the gold and silver Rainbow Pearls which were in Lady Joka's possession but were recovered by Sesshōmaru who placed them with his newborn twin daughters for safekeeping.
 * Jaken is revealed to have been the twins caretaker during their first four years; having used the Staff of Two Heads to create a demon barrier to hide them.
 * Inuyasha and Kagome's fates are revealed: They were absorbed into the second Black Pearl, and have been trapped within the demon graveyard ever since, and are very much alive. Their release is imminent as Inuyasha's Medio Zangetsuha ability is eventually required.
 * The Shikon Jewel itself is said to have prophesied Lord Kirinmaru's downfall by "beings that are neither human nor demon but also from an impossible entity that surpasses time"
 * It was, in fact, the dream-gazing spell that revealed the location of young Towa and Setsuna to Zero.
 * It is revealed that Rin is Towa and Setsuna's mother. Though it had long been figured out by viewers/long-time fans as she is the only human girl Sesshomaru had ever cared for (though he did develop something of a soft spot for Kagome as well but likely only for Inuyasha's sake).

Episodio 15 (Hanyo no Yashahime)