Both have calm, slice-of-life nature about it.
Restart has a character that decides to quick his job because he is pissed at the boss and not being appreciated. Meanwhile Rental has many stories about people and their life, which also at times include trying to find one's meaning in life and love.
Rental also has stories with positive LGBTIQ+ representation.
Rental deals with alive people and their problems, experiences, and emotions.
Meanwhile, Dele explores people which already passed away.
Both series are episodic and have well-developed characters.
Similar tale of someone who is in a rental service meeting different types of people every episode while struggling with the realities of life.
Rental Nan mo Shinai Hito is the male lead doing all sorts of random things for the clients while Rental no Koi is the female lead accompanying the client as a temporary girlfriend.
Both are heartwarming slice of life drama.. it's just captured your heart when watch it.. simple yet great story.. ^_^ encounter with different kind of people.. totally recommended!!
One is a movie and another is a series.
Both of the leads have an occupation in which you can rent a person.
In RaF, it's only for the purpose of being a friend for a day.
In Rental-san, the main lead can be rent for a specific task which requires to do accompany a person in doing a specific task (see more: description of the drama). Rental-san is based on a true story too.