Tantei Gakuen Q EP14 - An Announcement From the Spiritual World! The Forbidden Truth!!

Kyuu begins his deduction and immediately points out Kaoru’s brothers as the culprits. As they had worked together to Murder the spirit medium Asakura and their aunt because she had the misfortune of discovering the murderer’s true identity and attempted to blackmail them. When the brothers refuse to confess to their crimes, Kyuu is forced to reveal the bitter and shocking truth: the spirit medium Asakura was in fact their mother. They don’t believe this at first, but their mother’s secretary confirms that it is all true. Leaving them shocked, they try to kill themselves but are stopped and arrested. Later, Kyuu finds Kaoru’s mother’s will and she states that she show this to her brothers and reconcile with them.