Konoha's Electric Prodigy

A hapless fellow accidentally transmigrates after ranting about A Certain Scientific Railgun. He arrives in the Naruto world and becomes, in a manner of speaking, the daughter of the Second Hokage, Tobirama, and the aunt who makes Tsunade incredibly uncomfortable.

“Little Tsunade, I think Jiraiya’s a pretty good guy. Why not give dating him a try?”

“Little Jiraiya, if you want to win Tsunade over, you need to do this, then that, and finally this. Got it?”