The Forbidden Research...Nozomi's Hidden Secret!

Ichigo awakens at the Urahara Shop, mystified as to how he was rescued. Urahara tells him that there are several ways to escape the kouryuu but none to escape the Koutotsu, so it is unknown how Ichigo escaped. Elsewhere, Mayuri uses his zanpakutou to drug Inaba, which slows down his ability to think. However, Isaba then summons Isane's reigai and attacks her. At the Urahara Shop, Rukia then explains Project Spearhead to the rest of the group in which modified souls were used. Inaba then takes the soul candy from the reigai and swallows it, resulting with Inaba being rejected from his body and the reigai taking the effects of the drug. Inaba, revealing his backstory as the one who created modified souls, then resurrects most of the defeated reigai, unleashing their true strength. Nozomi admits she was the first modified soul.