Bakumatsu Heisei Kid

From Shogakukan: One day a mysterious woman appears all of a sudden before Makoto Akimoto, a fifth grader in today's Heisei period. But when Makoto is led by this woman to Kyoto in the last days of the Tokugawa shogunate regime...!? Moreover, what they find there is a mysterious world where weird creatures are springing out! What fate awaits Makoto?