"If I have a girlfriend, I think it's a good situation that she suddenly hug me from behind when [I'm] waiting for her in the station," developer Maito Omori said in this YouTube video.
In Japanese, the girlfriend coat is called "Riajyuu Coat." According to Kotaku, "riajyuu" is slang for "someone who is pleased with their life outside the Internet."
Obviously, this "coat" should be taken with a grain of salt. In fact, it doesn't really seem like a coat at all - more like a system cobbled together with materials laying around a garage, then refined in the electronics lab, that can be "worn" with any coat. Still, Omori and the dudes behind the tongue-in-cheek coat seem to have a playfulness about them that negates anyone who thinks they're taking themselves too seriously. Need proof? Check out the way they crack up in laughter at the end of their video.
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Don't expect to see this "coat" on the streets of Japan anytime soon. It's not for sale and remains more of a concept device so "everyone can get the feeling of having a girlfriend," according hardware engineer Hikaru Sugiura.