The 4th Hokage

Just wonderin', what happened to Minato Namikaze after he sealed
the Kyuubi to Naruto? I didn't catch that part...And what chapter does
the story belong..I really wanted to know about it..

Info on 4th
At the age of ten Minato graduated from the Academy. Shortly afterwards he became the student of Jiraiya alongside two fellow team members. Under the Ero-Sennin he would greatly increase his skills and impress Jiraiya with his tenacity. Jiraiya would select Minato to carry on the heritage of toad summoning. His skills would further grow with the development of Rasengan and Hiraishin. The latter technique would grant him the nickname "Konoha's Yellow Flash" because of the way he and his bright yellow hair would flicker out of existence to appear elsewhere.

As the years passed Minato became Chuunin and later Jounin. As a Jounin he became sensei of the team of Hatake Kakashi, Rin and Uchiha Obito. As a gift for Kakashi's advancement to Jounin, Minato gave him a unique kunai marked with one of the Hiraishin transportation markers. Later in one particular battle, this technique allowed four Leaf ninjas to throw teleportation kunai at 50 Rock-Nin. Using the transportation technique, he was able to move from kunai to kunai while they were in the air, to wipe out all 50 with little trouble. After this battle, his student Rin used Kakashi's kunai to bring Minato to her location to protect her and an unconscious Kakashi from Rock ninja. Unfortunately by the time he arrived Uchiha Obito was already dead, he managed to save Kakashi and Rin though. They would later go on to fulfill their mission and help repel the Rock invasion.

thanks for the info..
that I didn't know...

thats ok