Cinderella ni Naritai!

Kuramochi Bon works at a fast-food burger joint, taking out the garbage. All his life, he has been told he is ugly and has never even held hands with a girl. A chance encounter with a mysterious doctor leaves him with 3 bottles of a potion which will make him look like someone else for 24 hours. When Bon gets transferred to another shop temporarily, he decides to use his potion to transform into the most handsome employee. With his new-found looks and confidence, he reworks the shop and asks the girl of his dreams out on a date.
(Source: wiki.d-addicts)