How to turn a Cherry tree spirit into an idol

The protagonist who lost his mother in a childhood accident. Wandering in longing for his mother, He returns to his hometown at the urging of his father. But the darkness of his heart does not easily dissipate... Unable to adapt to the much-changed scenery of his hometown One day, he experiences something strange...! In spring when the 'cherry blossom' tree planted in the backyard with his mother blooms.  Suddenly, there was a 'young girl' standing under the shining tree. And from that moment on,  His daily life begins to be colored again with various hues.