Amagami

Also known as:  EbiKore+ Amagami (PS2, PSP), Amagami GS (PC)

The story of Amagami centers around a second-year high school boy who find himself uneasy during Christmas time due to an experience in the past. However, this year at Christmas, he gets his last chance to ask out a graduating female senior named Haruka Morishima - or one of several other classmates. (ANN synopsis)

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Producers, official website and other details: VNDB, Wiki