Real (2013)

Koichi and Atsumi are childhood friends who eventually fall for each other and become lovers. Atsumo, however, commits suicide, but instead of dying becomes comatose. Thanks to a new procedure Koichi is able to enter Atsumi's subconscious mind in order to understand what prompted the suicide. Upon entry into his lover's subconscious mind he asks her to locate a drawing from her childhood, which is the key to the minds' melding and unravelling the mystery of her actions.