Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai. Movie

Dealing extensively with the concept of adolescents about friendship, attachment, and intimacy as they deal with angst, grudges, and confrontation with one another. The distinctions are in the ambiance, atmosphere, and concepts used. I think both can give the same feelings of grief or sorrow as both have a heavy dramatic premise. 

Similarities: Group gets torn apart by some event in childhood Fixing relationships of the group Focused on the Female MC Emotional 

This anime its deals with themes of loss, grief, and friendship. 

This anime deals with themes of loss, grief, and healing, and it also features strong character development and emotional moments that can leave a lasting impact on viewers. 

Heartbreaking romantic series. Both series are very similar. Both have main character that found themselves a spirit / ghost. They also face lots of common themes, such as impossible love between human and spirit. 

This anime shares similar themes of loss, nostalgia, and the power of memories. It revolves around a group of childhood friends who have drifted apart and reunite. The anime explores the characters' individual struggles with their past and how they learn to move forward together. 

Two stories about a certain person dealing with the lost of their love. While AnoHana focus on a group of friends, Hal focus in just a couple. Heart breaking scenes where main characters just seems to have lost the will to live. Both shows have a stunning animation, with a beautiful and touching OST. A must watch for persons who enjoy angst.