A miniskirt Santa appears before Sakuta, calling herself Touko
Kirishima. She's been handing out presents--Adolescence Syndrome. And
one of the lucky winners is Sakuta's classmate from middle school, Ikumi
Akagi. According to urban legend, posts tagged #dreaming are filled
with prophetic visions and Ikumi is using those posts to play hero.
Sakuta sees the results of this firsthand when he spots her saving
someone. But then a poltergeist attacks and apparently this is all the
fault of his past somehow?!