On a hot summer day in Kyoto, a young man walks toward his apartment, dreaming of turning on the air conditioner and cooling down. But before he can turn his dream into reality, disaster naturally strikes in the form of Ozu, who spills soda all over the remote. With the air conditioner rendered completely unusable, the man and his friends are left to suffer in the terrible August heat. Just when all hope seems lost, the group finds a true-to-life time machine in their storage room. Not knowing the dire consequences of doing so, they decide to travel back to the past and grab the remote before Ozu even has a chance to destroy it. What awaits them on the other side is a staggering adventure none of them are prepared for.

The 7th Division's Private Hyakunosuke Ogata and former Shinsengumi Vice Commander Toshizou Hijikata find themselves on opposite sides of a gang war in Barato after hearing rumors of the Hidoro gang possessing an escaped prisoner's tattooed skin. With a lead to the hidden Ainu gold close at hand, the two gladly take up arms but a betrayal will force both sides to think twice before carelessly jumping the gun.

At last, the Sanzou Party has arrived in India. In this foreign land, where the anomaly's influence runs rampant, their battles only heighten in their violence. And also awaiting them is their tragic fate from 500 years ago— What will they find at the end of their long and treacherous journey?

Kyousui Sui Tougoku inherits a traditional Japanese-style cafe called Rokuhoudou from his grandfather, which he manages alongside Gregorio Gure Valentino, Tokitaka Nagae, and Tsubaki Nakao. Their hospitality par excellence undoubtedly turns any one-time visitor into a regular. Having gone through their own share of trials and tribulations, the staff at this modest cafe do their best to serve their customers—whether it be through tea, sweets, or even helping with the various troubles one may have. Although most days pass pleasantly, the small world of Sui and his friends takes an unexpected path when their reputation as a cafe flourishes overnight.