Otome wa Boku ni Koishiteru 2

Also known as:  Otoboku 2, Otome wa Boku ni Koishiteru: Futari no Elder, The Maidens Are Falling in Love with Elder Sister: Two Elder Sisters, Otome wa Boku ni Koishiteru Futari no Elder Portable (PSP)

Otome wa Boku ni Koishiteru: Futari no Elder is the sequel to the school-themed eroge shortly known as Otoboku, which Caramel-Box originally released in 2005, featuring an opening theme song interpreted by the Japanese singer Yuria. The story is set in the same Seio Girl's School as the first game and its spinoffs. A beautiful, silver-haired student named Chihaya Kisakinomiya is transfering into the all-female student body at Seio. The catch is that Chihaya is a boy. (based on ANN synopsis)

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Producers, official website and other details: VNDB, Wiki