Tantei Opera Milky Holmes is getting a full second season starting in January, but J.C. Staff followed up their original series with a "Summer Special" episode in August. This will be released on DVD December 7th.
After some pushing by Irene and her father and a lack of support otherwise, Kokoro stubbornly quits her job as a police detective to become an idol. She soon finds the idol life draining and starts to miss her old detective life. When Henriette notices Sherlock's loneliness without her, she stages a statue theft in order to convince Kokoro to return to the force.