According to a popular love-sim game by Cocktail Soft/F&C-FC01.

Asau Daisuke can be a secondary school student plus a gifted artist - but he's currently experiencing a block, which keeps him from painting. His childhood friend, Tachibana Amane, who loves him deeply, persuades him to execute a portrait of Kimikage Yurina, a woman with has heart problems, before Yurina undergoes surgery. When rediscovering his art, Daisuke also realizes the love that he and Amane feel for each other.