 If you liked
ef: A Tale of Memories.
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 ...then you might like
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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Both are series that rely on cheap drama and emotional twists hinged around shallow unconvincing characters who are based around these twists. They both construct their emotional drama recipes similarly, and contain elements of romance, so I assume appeal to a similar audience
Both are very well made series about a group of teens dealing with guilt, loss, and love.