I used the search and found that this game doesn't have its own thread. Time to fix that.
Basic facts:
It's a PS3/Vita game that's a port of the PSP game Akiba's Trip 2. It's published in North America by XSEED and was developed by Acquire.
What's the game about?
Vampires (aka Synthisers in the game) are draining otaku and others in Akihabara of their life force, leaving them apathetic. Lured in to a drug trial by the promise of limited edition figurines, your character is turned into a Synthiser but rescued by purple-haired mistress of parasol-fu Shizuku Tokikaze and fed her blood to prevent his turning into a monster. You and your scrappy band of friends fight against the Synthisers. Since they're vulnerable to sunlight, this naturally means bashing them about until you can rip their clothes off, at which point they disappear into a puff of smoke.
What? Seriously?
Yes. This game doesn't hesitate in making fun of itself to the point where you have a dialogue option for the training fight of "I wish they sent girls after us instead of guys".
So, is the game as hot as it sounds?
Perv. As I mentioned, the game's a port of a PSP game, so the graphics, even as they have been improved for the PS3 and Vita, are not amazingly detailed or attractive.
What's the appeal then? What's the game like?
It's a sandbox game set in Akihabara. If I had to pick a game that it was like, I'd say that it was like the Yakuza games. I'm not sure if there are minigames like that series, but I'm not sure what you could expect from a PSP game. You can also apparently work up to a relationship with either purple-haired girl or childhood friend. There might also be something involving Norwegian woman working at a maid cafe, underground Idol singer and inappropriate businesswoman, but I haven't gotten that far in the game yet.
Also, you can talk to different people in the streets. The Boys Love Enthusiasts will say things like how she "knows" those two businessmen are lovers or how much energy needs to be devoted to fantasies about two hot guys doing each other. This is a game that knows what its audience wants and isn't afraid to shamelessly go for it.
The game has Japanese voices enabled, and the English voices are apparently kind of dire.
So how's the gameplay?
The fighting...is mediocre. So far, it's been running around to different areas to do fetch quests or fights. You get experience points, but I'm not sure what they're used for. The areas are small, and there's a loading screen in-between them all.
On the other hand, when I stripped this dude, it turned out he had women's underwear underneath, so there's that. Also, I don't know whether or not there's a Raw Danger!-type error, but a lot of the Synthisers I've met in the street are foreigners.
Would you recommend it?
I'd say that the game is worth a try. You'll know pretty early on whether or not the game appeals to you, despite the gameplay.