In a vast frozen waste, twins Sou and Seiji have been fighting each other for millennia. Ms. Aki says that to change the world, they need the twins' "Reverse" power, and Nagara and Mizuho come to assist. Yamabiko questions Sakura, one of Mizuho's cats.
When we overcome sadness
on a 2000-light-year-long train
عندما نتغلب على الحزن على متن 
قطار يبعد ألفي سنة ضوئية