Nanaboshi Kanata is a student who has been traumatized by love. He is lying down in front of the Shiratori Academy gates in protest of it being torn down. The weather forecast is sunny with a chance of UFOs. This is the day he comes into contact with the Guide for Galactic Lovers. One small step for man, one giant leap for the plot. His classmate Yamada turns out to be an alien. UFOs start raining down from the sky. On top of all that, the Galactic Empire is demanding him to fall in love.
When he returns home, he finds that the sofa of his living room has been occupied by the Chancellor-Elect. One thing happens after another, and Kanata finds himself the target of the President of the Galactic Empire’s affection! “Analysis of both routes complete. Rate of success with either party is immeasurable.” When the impossible becomes possible, Kanata and the heroines engage in the Fourth Loveduction.