This is the one you put on when you want twenty-something minutes of pure low-stakes chaos and nothing else. The whole engine is Nana ditching her study session for a New Year's shrine visit, then the horror of realizing every other Nana had the exact same lazy idea at the exact same time. No villain, no stakes, just seven versions of one girl trying not to be spotted as seven versions of one girl in a packed crowd. Then the otoshidama goes missing in that crowd, and the plan they cook up to replace it is so dumb it makes everything worse, which is the correct outcome. The joke is that all seven have different personalities and every single one of them is bad at this. It's a holiday card from a show that knew its only job was to be funny, and it does that job.

Nana Suzuki decides a New Year's Day trip to the shrine beats studying. The outing goes sideways when she discovers that her six clones have all turned up at the same shrine. She is already unhappy about sharing her holiday allowance with them, and things get worse when their New Year's money is lost in the crowd. The brainy Nanasama proposes using the device behind Nana's cloning to boost their funds, but the idea backfires when Nana multiplies again, this time into 49 copies. The result is a single-episode comedy OVA about a holiday outing that keeps spiraling out of control.