Toru Hayashi is an unremarkable bachelor who lives with his mother, until one day a young woman named Rumi moves in in the apartment upstairs. Rumi is a self-proclaimed master thief, but she needs socially awkward Toru's help to actually kickstart her so-called career.

Toru Hayashi is an unremarkable bachelor who lives with his mother, until one day a young woman named Rumi moves in in the apartment upstairs. Rumi is a self-proclaimed master thief, but she needs socially awkward Toru's help to actually kickstart her so-called career.