Mari, her best friend, and her best friend's brother use a special compass to travel through time.

Mari Hayase is on a mission to go back in time and meet eight of the most prominent scientists and inventors in history. With the help of her two friends Waka Mizuki and Jun Mizuki she'll find herself up close and personal with famous figures like Benjamin Franklin, Alexander Graham Bell, Thomas Edison, and so many more. What's her purpose and mission? Hopefully not getting stuck in the past.—Crunchyroll