Yamada Tsuyoshi is a weird, creepy, coward Otaku. One day, he rides a train bothered by a drunk, fat man. This man starts to trouble a beautiful woman, who Yamada notices as attractive while sitting in front of her. He decides to help her, to stand up and tell the old man to go away. In return, she sends him Hermes teacups as thanks. Inexperienced with women, he turns to the single men's message board for advice and support.
It's about how bunch of otaku are trying to support each other through a website.
In Densha Otoko they are trying to support one member's otaku love relationship, while in Akihabara@deep they are gathering together to fight against bullies.
It's about their friendship and the way they support each other, and of course it's about Akihabara and the mania of the anime otaku.