Kidnap Kidding: Aoiro Savant to Zaregotozukai no Musume

The 10th instalment of the Zaregoto Series announced in the 20th-anniversary video for Nisio works. Kunagisa Jun is Ii-chan and Tomo's daughter, an "ordinary" 15-year-old attending Sumiyuri Academy. One day, Aikawa Jun kidnaps her and brings her to the Kunagisa Organization, where she happens upon a grisly murder. (Source: Amazon JP, translated)