Gokko means playing a game of make-believe.
One day, a boy called Ikei comes to Fuyuko's place and claims to be her brother. She doesn't believe him, however she allows him to stay at her house. As a wannabe future actress she then starts playing Gokko with him to improve her acting skills. Where will it lead them? A collection of short stories. (Source: Wataame Shoujo)