Mou Ichido, Nandodemo.

Friends-with-benefits turned passionate lovers Takahiro and Tarou have never been better. They've started living together since Tarou got a job and Takahiro started college, and now they're more than ready to take the next step in their relationship...but when a freak accident takes the last two years of Takahiro's memories from him, can he find his way back to the love of his life?

(Source: Fantasista Inc.)