During the mid 19th century, the people of Edo were banned from experiencing a luxury lifestyle (including dealings with fireworks, inventions, and performances). Regardless, Seikichi Tamaya, fireworks artisan, can’t live without creating bigger and better fireworks. One day, the monotony was broken by the arrival of two powerful beasts; and while one was defeated, the other escaped due to the distraction caused by Seikichi’s fireworks. Subsequently, a beautiful and mysterious girl soon appeared and asked Seikichi to create fireworks that can reach the moon! Now, while trying to discover the truth behind the girl and the beasts, can Seikichi succeed at creating fireworks that can fly into the depths of the sky?
In Gintoki's Japan, the arrival of the various space races known collectively as the Amanto ended the era of the samurai. The Amanto's highly advanced technology resulted in total conquest and a severe economic shift. Now, former samurai such as Gintoki scrape together whatever livelihood they can. Gintoki's profession of choice is that of a yorozuya: he'll complete any job for money. However, he’s unmotivated; and spending most of the day on the couch with the latest issue of Jump and a carton of Strawberry Milk is his preferred pastime. It turns out that his new unpaid employees, Shinpachi and Kagura, are going to interfere with his pastime even more than with his "work"! Of course, none of this means he has really given up on his samurai ideologies!
Although they approach the theme from two completely different angles, both Gintama and Oh! Edo Rocket are constructed around the recurring gimmick of deliberately anachronistic technology set against Edo-era Japanese civilisation. In both anime, a strong undercurrent of humour plays off against moments of seriousness. You may not like one if you liked the other (I didn't), but you can't help but find it interesting.
When Hayate was young, Santa appeared in a dream and told him that if he worked hard, he’d be rewarded. Thus, with an unbreakable will, the unfortunate Hayate has struggled through life holding onto that belief. In the present, his parents are lazy and unemployed, forcing Hayate to work several jobs to pay the bills. As if things couldn’t get worse, Hayate’s parents then run away, leaving him with an enormous debt and loan sharks on his tail! Naturally, the best solution to find money fast is… to kidnap someone?! A girl named Nagi is the target, but due to an unfortunate miscommunication, she believes Hayate has proposed to her and falls for him hard. After Nagi paid off his debt, Hayate must now work as her butler in order to repay her; but first, he must adapt to her wacky world!
The future of humanity is in peril, as they are confronted with the threat of an intergalactic clash with a warrior-like alien race, and the only one who can save them is... Captain Tylor?! Join a crew of misfits and rejects including an alcoholic doctor, a gorgeous nurse, an anal-retentive commander and a bunch of really stupid marines as they try to make it out in space and to discover whether their captain is a misunderstood genius or a total moron like he seems to be.
Before talking about the common points of these two anime, I need to point out that ICT is a sci-fi anime; but there is still great character development and humour. In Oh Edo Rocket there is plenty of random humour and a regular appearance of modern day technology, which makes it look like a stage play (which is what it is based on, really).
Both ICT and Oh Edo Rocket feature protagonists who think and act in different ways than what the political/military powers want them to. Both anime have an nice storyline and a lot of humor, and make you look forward to seeing each episode. So if you don't mind the stage play/random humor of OER (and the outdated animation), you'd like one if you liked the other!
Simon lives a boring life in the underground village of Jeeha, where his main job day in and day out is to dig tunnels. His close friend Kamina, however, longs to bust out of their oppressive existence and reach the surface world where open skies and adventure await! One day, during his usual digs, Simon discovers a robot with a big face buried amongst the rocks. No sooner has he shown Kamina his mysterious find when two beings from the surface crash land into Jeeha Village - one is a gun-toting woman calling herself Yoko and the other is a terrifying mecha piloted by a Beastman! Seeing their chance to escape village drudgery, Kamina rallies Simon and Yoko to defeat the invader using their new robot, Lagann. However, upon breaking out onto the surface world, Simon, Kamina, and Yoko encounter enemies more powerful than they could have envisioned. Their fight for adventure just turned into a war for the survival of the human race - will their lust for freedom hold out against such terrible odds?
Oh! Edo Rocket is based off a play by Kazuki Nakashima, who also wrote the script for TTGL. For this reason, O!ER features tons of references to TTGL (pseudo-Kamina shows up a few times), and have a similar type of humor.
Both feature a huge colorful cast that's impossible not to like (even most of the antagonists are likeable). Some characters are extremely similar (Nia and Sora might as well be the same girl). Both groups of main protagonists are at odds with an oppressive government and come up with... interesting ways to fight back. The moon and some sort of human-like beasts also factor into both stories.