Autumn has arrived in Tatsui-chou, which means it’s the perfect time to admire the changing leaves, indulge in a nice hot bath, and enjoy some Halloween festivities! Murakami and Ilsera are just settling into the season when Murakami suddenly gets kidnapped—with the perpetrator being none other than Ilsera’s half-brother Zarak! Faced with a progress report from another world and complicated sibling relationships all around, can these two make it to winter? Or will it be the end of their unlikely roommate arrangement?