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It was a while before that. Jiraya and Tsunade were talking on a bench, then Jiraya had a lil flashback with Minato and Kushina.
But i would bet on jiraya himself, something fishy about kushina naming her son fishcake XD
Only problem it wasn't confirmed then, it was only foreshadowed.
3 posts above your first.it says it right there...get with the program guyOnly problem it wasn't confirmed then, it was only foreshadowed.
it was minatos idea too