In the manga, after the Three Kings arc, Yusuke goes missing for just a year and a half while the 3K stuff resolves, reappears to the group and reveals that a lot of the series has been the result of King Enma fucking around with things behind the scenes to keep the Demon Realm locked away, causing Koenma to lead a revolt against him. Yusuke goes back to ghost detectiving. His father comes back into the picture. The group foils a terrorist attack, with Yusuke hearing some words of advice from Genkai shortly before she passes. Then we get Genkai's inheritance, the group all going to the beach, it being revealed that Yusuke hedged his solution to the terrorist attack on his feelings for Keiko, and then everybody runs off to the beach.
The anime fast forwards after the Three Kings arc to Yusuke having been gone for two years, the group does the thing with Genkai's inheritance without him, and then Yusuke reappears to everyone on the beach.
Hmm. Interesting, it's quite different indeed.