While some tears are natural, she looks like she's crying. However, given that she's most likely getting fucked by Kira (note the brown bush) I think she's having the time of her life.
Aa... Natsukashi no Heroine-tachi!! Daisuki!! Beach-kunああっ…なつかしのヒロイン達!! 大好き!!ビーチクンUrushihara Satoshi Collectionうるし原 智志コレクション