Ore No Joushi Ga Wakagaecchaimashita summary:

My straight-laced boss has suddenly turned into a child?! Shimizu, a new employee at a real estate agency, realizes that his boss Ueno, who is well-known for being unfriendly, is actually keenly observant of all his subordinates. From that day on, Shimizu finds himself hopelessly interested in Ueno, but is unable to close the distance between them. The day after wishing for, “a certain something” on a shooting star, he pays a visit to Ueno who is off sick from work. Once there he finds that Ueno has been transformed into a child…?! A pure love comedy between a puppy-like subordinate and straight-laced boss!