Tonari no Totoro, Hotarubi no Mori e Recommendations
Both are very similar slow-paced anime movies where a girl finds a friend Youkai (or forest spirit), although Hotarubi has sadder ending.
Both movies take place in rural japanese environments and revolve around the main character's interactions with yokai/supernatural beings. They both also have that pleasant summertime feeling and have nice soundtracks to go along with nice visuals. Hotarubi no Mori e has more of a romantic storyline, while Totoro is more of a family story and adventure.