LP

is an alien from a mysterious planet

who grew up to become a defender of the galaxy as a member of an intergalactic police force in the year

3001. He goes by the name Shiro.

During an immense battle with the force's greatest foe he was hurled backwards in time and into Earth's atmosphere! He was found floating in a river by a woman who took him back to where she lived; a large and secret martial arts academy run by a legendary master who was dedicated to fighting corruption and the head of a crime organization dedicated by savage ronin, evil ninjas and drug and weapons dealers - defeating them all at night while working as a doctor by day.
When LP woke up he found that he couldn't remember anything in his past or his abilities or even his name and his body had been de-aged to that of a teenager's. He found out later from the woman that he was in the mid-years Japan's Edo Period. Later LP & the woman fell in love; he found out the woman (age 18) is the Master's personal assistant/a nurse by day. On his birthday (16 human years) she gave him a "gift" which was actually his time machine/weapon that she had found with him in the water years ago, she promised him it would bring good luck. (All of the officers of the police force are equipped with mini Time Machines)
But he couldn't remember what it was or how to use except that he used to use it! Ever since, strange enemies have been appearing from the future to try to either kill him and/or his friend or try to steal/destroy the weapon.


And so, on top of trying to become a great warrior, LP is trying to start a relationship while battling the forces of evil of the past and future past!