Well, well, the all-out effort searching for this SP due to the ad at the last episode of the main drama pays off (I usually do not look for SPs in doramas because it is hard to find them).

For me, Sota somehow did better in doing Rei vs Saku here compared to the main drama. I can feel the struggle of Rei getting control and Saku is more psychotic. But still, whatever first thing Saku did after the 'switch' (especially when meeting Sawa) is amusing rather than creepy. It is a bit unfortunate that they abruptly ended the conflict, but still it's worth watching