Danbooru-based image board with a specialization in high-quality images.
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disc_cover goshuushou-sama_ninomiya-kun takanae_kyourin tsukimura_mayu

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I guess this is some poster that comes with the limited edition of the DVD, but thats only my guess/opinion. Dunno if it's true until I get it sometime next week.
It's mayonnaise. She had an accident in the kitchen.
It doesn't look like offical art or anime art. Must be a doujined work.