Big Sis Loves Nobody Else But You - Playing Bride

It's the summer solstice and Maria is spending time with the twins to help them with their homework. After discovering that it's actually Maria's birthday, Haruki and Itsuki decide to promise to do whatever she likes as their gift to her. So when she says that she wants to get married to the both of them right away, the two soon realize that Maria wants more than just the pomp and pageantry of a makeshift wedding...