Kidnap Kidding: The Blue Savant and the Nonsense User's Daughter

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)