
Sgt. Frog
Keroro is a frog-like alien sent from his home planet on a mission to conquer Earth. But when his cover is blown, his battalion abandons him and...

The story of the anime revolves around Dandy, an alien-hunter. His job is to seek out new aliens never seen before, and receives a reward whenever he finds a new species. His mission is to find those new species faster than anyone else as he travels the galaxy.
The opening is more atmosphere than hook.
Related recommendations with overlapping genre, tag, mood, or tone signals.

Keroro is a frog-like alien sent from his home planet on a mission to conquer Earth. But when his cover is blown, his battalion abandons him and...

Life isn't easy in feudal Japan... especially since the aliens landed and conquered everything! Oh sure, the new health care is great, but the...

Bang Brave Bang Bravern is set in a world where humanoid armored weapons known as “Titatonostrider” (“TS” for short) are used in warfare.

Justy Ueki Tylor had his life all planned out: join the military, get a cushy desk job, and then retire with a big fat pension check. The perfect...

It all begins when aliens invade and threaten to conquer the Earth! However, one member of the human race is chosen at random to duel the aliens...

An anthology series adapting 8 short stories created by manga artist Tatsuki Fujimoto between ages 17 and 26. 1) A Couple Clucking Chickens Were...

Odd Jobs Gin has taken on a lot of odd work in the past, and when you're a Jack of All Trades agency based in a feudal Japan that's been conquered...

Rentarou Aijou was rejected 100 times in middle school. He visits a shrine and prays for better luck in high school. The God of Love appears and...