A Certain Magical Index

Source: Episode 3

He easily gets the job done. Source: Episode 3

Some armed machines appear out of nowhere and attack them. Source: Episode 3

He appeared out of thin air. Source: Episode 2,3

They make their way through the town avoiding the mob. Source: Episode 2

A mob finds Touma and goes after him because he is an Academy City student. Source: Episode 2

He would have drowned if it wasn't for her. Source: Episode 1,2

This happens the same time Touma is with mini-Misaka. Source: Episode 18

Not only does he spend time with Misaka, but also one of the Misaka clones and mini-Misaka. Source: Episode 18