Darkness Hiro's story.
Darkness Hiro was born for Hiro. After Tadashi past away, Hiro didn't love himself and he behaved to make others happy. Tadashi was a brave man with spirit of own sacrifice. Now he can't scold Hiro because of his death. So, Hiro can't know how can give delight to Tadashi in heaven. Hiro thought if he braves himself like Tadashi, it will be the delight to Tadashi. But, Hiro's heart will be broken by keeping behaving like Tadashi. In addition, Tadashi was the only one who loves Hiro in that world. Wasabi and Fred and SFIT members get along with Hiro. But they have their life. They can't love Hiro like Tadashi. After Tadashi's death, no one loves Hiro. But Hiro tries to behave for others, without being afraid of own sacrifice. Darkness Hiro was born only in the purpose who loves Hiro. Darkness Hiro will disappear when Hiro could love himself. Hiro has begun to think that he doesn't wish Darkness Hiro to disappear.