The Hakozume Drama CD series produced by Frontier Works is about you (the listener) being stuck in a box with different characters. The series features realistic dummy head mic: the producers surrounded the area around the mic with wood to try to convey the "trapped in a box" feel to it. Its first release for January 23rd (today). Here's a list of characters in the series:
CD 1: Knight CV: Toriumi Kousuke
An unnamed knight, who takes his job very seriously, has been assigned to protect you, the princess. The two of you meet after he saves you from a group of robbers. This CD is scheduled to be released today, January 23rd.
CD 2: Leonheart and Rutovich
CV: Miki Shinichirou and Okamoto Nobuhiko
This CD features you and a pair of vampire brother being trapped in a box together. The older brother Leonhart (Miki) comes off as a calm, collected, and emotionless man, speaking in an extremely polite manner. As a vampire, he gets excited when sucking blood. He has a scent fetish and has a specific interest in women who smell faintly like shampoo around the neck. The younger brother is Rutovich (Okamoto). Called "Ruttsu" by his older brother, Rutovich is the complete opposite of his brother: he shows a variety of emotions and is always smiling. Being a younger vampire, he cannot yet suck blood. But that does not stop him from being highly sensitive to blood.
CD3: CV: Morikawa Toshiyuki
This CD features you being trapped in a box with a fox spirit/god. Many years ago, he was a very powerful white fox that served the god Inari. Although he prefers transforming into a young man, this spirit has the ability to change into any other type of human he so chooses: be it man or woman, old or young, he can do it all. Despite his age, he has a strong sense of curiosity and a hint of mischievous that surrounds him. He finds enjoyment in people who are flustered. This CD is scheduled to be released March 27th.
CD 4: CV: Shimono Hiro
This CD features a wizard. After hearing his beloved childhood friend (you) enrolled in a school of magic, naturally he followed her. A natural genius for magic, he excelled quickly, with the desire to protect you driving him. After his graduation, he formed a party with a hero, monk and swordsman. He is very pushy and doesn't think before he acts. He tries to hide his fear of the dark from everyone, thinking it would be very embarrassing if anyone knew. This Cd will be released on May 24th.
If you buy all 4 CD's from Animate you can get the tokuten CD which features all five character stuck in the same box. It is unknown if the listener will be involved in this CD. It does not have a clear release date as of now, but it is tentatively scheduled for June-July of this year.