Sexy Voice and Robo Vol 1

From the VIZ Media edition

Working part-time as a telephone-dating operator, Nico Hayashi has plenty of clients eager to engage her in titillating conversation. But what her customers don't know is this: the person they're flirting with is really a 14-year-old junior high school girl with a secret agenda.On the phone she's known as Sexy Voice. But, really, she's more than a professional flirt. Secretly, she wants to change the world and maybe become a spy and fortuneteller, too.Along for the ride is her friend Iichiro Sudo. He's an underemployed twentysomething hipster with an obsession for collecting toy robots. Together they are Sexy Voice and Robo...two people doing their best to bring some hope into this crazy world.

Source: Anime News Network Encyclopedia