The opening credits is an epic montage of Narita, Sukekubo and Akiko fighting off a horde of alien invaders... which turns out to be a dream Narita was having.
The closing credits is a montage of Narita and Baradagi carrying out romantic activities: walking along the road, having dinner, seeing a film (and ducking out of the way of Kami and Yuko).
There is a scene after the closing credits: Baradagi chomps through dinner at a café, to Narita's dismay.