Episode 1, Kohaku, with his memories returned is finally reunited with Sango, Moryomaru possesses Naraku's heart, Hakudoshi is finally killed and Kikyo's time is finally running out.
Episode 2 Kagura is killed by Naraku and Kikyo learns that Midoriko, the priestess who created Sacred Jewel is trying to complete it through Kikyo.
Episode 3 After losing Tokajin, Sesshomaru's Tenseiga is reforged to produce the Meido Zangetsuha.
Episode 6 Moryomaru absorbs Naraku, only to be absorbed himself, along with The Infant, Miroku sucks in the Yoki concealing orb, but if he uses it again, he'll surely die.
Episode 8 Kikyo finally dies for real.
Episode 11 Kanna dies and imparts information about Naraku's weakness to Kagome.
Episode 12: Hiraikotsu is broken, Sango reforges it into a stronger weapon and Miroku can now Feel No Pain due to a special potion.
Episode 13: Sesshomaru completes the Meido, but realizes the technique was always intended for Inuyasha. And that the Tenseiga was once part of the Tessaiga.
Episode 15: The Meido Zangetsuha now belongs to Inuyasha and Tesseiga goes back to being a normal sword.
Episode 16: Kagome's true power is being sealed for some reason.
Episode 17: Magatsuhi, the Evil spirit that dwells in the Sacred Jewel, and he was the one who sealed Kagome's full power. He also easily beats Sesshomaru. However, Sesshomaru gets a new, more powerful blade named Bakusaiga, used to defeat Magatsuhi, he also regains his old arm.
Episode 20: The Sacred Jewel is once again complete as an utterly corrupt source of power for Naraku is exploit.
Episode 24: Turns out Naraku's wish to be a full demon wasn't true.
Episdode 25: The Sacred Jewel itself imprisons Kagome in a Lotus-Eater Machine so it use Kagome as a source of energy to continue the cycle forever; That and it turns out Magatsuhi turns out to be Not Quite Dead as the demons that make up him decide to stop Inuyasha.