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cleavage dress lala_satalin_deviluke pantsu sairenji_haruna screening summer_dress to_love_ru

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It's a pajama_dress!

In any case, it definitely looks lik they're outside with the wind and all that, and Lala is definitely not in pajamas (not to mention they're both wearing necklaces), so I think that it's safe to say that she's not wearing pajamas.
Green one is definitely not pajama, I’d say other one is more likely one