Kowareta Kagami no Kuni

Keiji is reunited with his childhood friend, Takane. When the two rekindle their friendship Keiji finds that Takane is no longer the shy boy he remembers. But one night something strange happens, Takane suddenly acts like and claims to be his late older sister Kanade. Why is the "spirit" of Kanade residing in Takane, and what can Keiji do to help...