iamhereforfun

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.

Keita is living any junior high school boy's dream. He has two older twin sisters, who compete for his romantic love in many ecchi ways, like good morning tongue kisses and abundant panty flashing.

Keita has two older step-sisters, Ako and Riko, but since they aren't related by blood, they love him in a lustful way. After a mishap at school, Ako and Riko finally confess their love to him.