Amisit

Rintaro Okabe is a self-proclaimed "mad scientist" who believes that an international scientific organization named SERN is conspiring to reshape the world according to its own interests. He and his friend Itaru Hashida inadvertently create a gadget able to send messages to the past.

A struggling manga artist and pizza boy extraordinaire in his late twenties. Seems like your average Joe, right?

Phantom of Inferno (Phantom ~ Requiem for the Phantom) is a story detailing the life of a 15-year-old Japanese boy who is kidnapped after witnessing the killing of a reporter. After being kidnapped his memories of his past life are erased and is given the choice to join Inferno or die.

(Wiki) Keima Katsuragi, a second-year high school student, is an avid bish?jo game player.