An Administration Bureau member and a school teacher at Ashiharabashi High School, which both Kei, Haruki and their friends attend. He serves as the middle man between the Bureau and the Service Club, giving out tasks by the Bureau to the Service Club and only providing some hints to Kei to help solve the tasks.

The ability to reset time might seem like the ultimate superpower, but if you forget what was going to happen when you reset it, how would you know what you needed to change? Or if you'd make things better or worse? That's the paradox that faces Misora Haruki until she's paired with Kei Asai, who remembers everything, even if they happened in timelines that have been reset. But there's still a catch: each reset point can be used only once and anything that happens in the 24 hours before a new one can be set will be locked in time forever. 
 
In a town where a mysterious agency seems to be controlling everything from the shadows and everyone has unexpected powers, the lives of Kei and Misora's friends and classmates will depend on how carefully they can use the Sagrada Reset. 
 
(Source: Sentai Filmworks)

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Nearly half the population of Sakurada, a small town near the Pacific Ocean, has some sort of unique power. These powers range from being able to enter the mind of a cat, to resetting the world back to a certain point in time in the past. There is a group known as the "Kanrikyoku" that controls and monitors the use of these powers. Asai Kei and Haruki Misora work for their school's club called "Houshi" club, which execute any missions received from the Kanrikyoku. Misora has the ability to reset the world 3 days. This means that all events and any memory of the past 3 days that "could have" happened, never happened. Kei has the ability to "remember" the past. Even after Misora uses her powers to reset the world back 3 days, Kei will retain those 3 days in his memory. Combining their powers, these two solve missions issued by the Kanrikyoku.
(Source: MangaHelpers)

Shintarou Tsushima