 If you liked
Saishuu Heiki Kanojo
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 ...then you might like
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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Two shows with a focus on drama and the personal relationships between a group of friends. Saikano has a war scenary, you can see the degeneration while the war for a friends group and some couples.
If you are looking for a drama, love triangle and slice of life while the war, this the best anime (better in manga)