JACO THE GALACTIC PATROLMAN

Retired scientist Omori lives alone on a deserted island while continuing his research into time-travel. His quiet life is interrupted when galactic patrolman Jaco crash-lands and decided to move in with him. Can Jaco get along with the old man long enough to save the earth from a dangerous threat? Note: Includes the epilogue and 1 extra chapter. — Description from AniList community (anilist.co).