My Girlfriend is the President (2009)

The Main Character Junichiro Hondo suddenly becomes that his childhood friend Yukino Ohama became the president of the ficticious United States of Nippon.

Storyline

It started out as an ordinary morning, woken up by my childhood friend. Had a good breakfast… complete with morning hard-ons. An ordinary, everyday eroge scene. Or… so it seemed. Things would never be the same from that day, as peaceful everyday life was blown to bits. An accident on a spaceship heading to earth, causes it to crash into the office of the Prime Minister of Japan. The ministers end up in a state too horrible to look at. To avoid chaos, the alien choses a girl who happened to be there, and to make ends meet, brainwashed all of mankind. Nippon adopts a presidential system overnight, and incredibly, a girl, my childhood friend, is the president. The world will answer to her every whim.