Here's what i think happened. Aoi remembers the trauma because he is the split personality. So he may also know how to get rid of himself. By forcing Aki to remember or by Aki falling in love? ( Only considering that since Sayuu is somehow helping Aki regain control.) So maybe Aoi decided he would rather end himself then be forced out. So shock therapy while he also got to have sex with Shiba, his love, one more time. Then Aki gets with Sayuu and Shiba finds someone who will love him forever. THE END ╮(￣▽￣)╭
Here's what i think happened. Aoi remembers the trauma because he is the split personality. So he may also know how to get rid of himself. By forcing Aki to remember or by Aki falling in love? ( Only considering that since Sayuu is somehow helping Aki regain control.) So maybe Aoi decided he would rather end himself then be forced out. So shock therapy while he also got to have sex with Shiba, his love, one more time. Then Aki gets with Sayuu and Shiba finds someone who will love him forever. THE END ╮(￣▽￣)╭