Toki wo Kakeru Shoujo, Angel Beats! Recommendations
Both show a strong value of friendship. In Toki wo Kakeru Shoujo the group is smaller (Makoto, Chiaka and Kousuke, who have always been friends) and their status in different timelines, while Angel Beats has more people involved and their friendship develops over the course of the battles.
Are animes with different themes but your ends also has minimal resemblance.....
Both are fun and sad anime at the same time. The endings are surprising and will make you cry a lot.