The Kobayashi twins, Megumu and Mitsuru, were named after historical figures, but only Megumu has grown up with a taste for history. So when Mitsuru is in danger of losing his weekends to extra history classes, he convinces his sister to swap clothes with him and ace his tests! After all, how hard can it be for them to play each other?

The earthquake is over, but the aftermath is still devastating the region. Mitsuru and Azusa try to put the power of the Tokugawa Group to good use while others, including Megumu and her mom, rush to Sendai to look for their missing loved ones. Megumu wants to hold on to hope, but Aoi still isn't picking up his phone...