I have a girlfriend, Mai, who is a university student and works at the same part-time job as me. Her best friend Hikari also works there, and the three of us get along well even in private. One day, Mai and I decided to have a takoyaki party at the house we share. The party was going well, and just when Mai was completely drunk, the mischievous Hikari invited me over and we ended up crossing the line.