Thoroughbred Doesn't Shake

The thoroughbred, Shiba Toshimasa, and the lion, Shishidou Ouga, are childhood friends and now lovers. But, as the son of a good family, Shiba faces the talk about an engagement to his thoroughbred friend, Touma Rei. Although he asked Touma to reject the engagement, Shishidou finds out about it...?!