Rascal Does Not Dream of a Lost Singer

Book 9 of the Seishun Buta Yarou series. Finally, the day of Mai’s high school graduation has arrived. While Sakuta eagerly waits for his girlfriend, an elementary schooler who looks exactly like her appears before him. Suspicious, and for all the wrong reasons... Meanwhile, Sakuta and Kaede’s father suddenly calls, saying that their mother wants to see her daughter. She was hospitalized because Kaede’s condition had been too much for her to bear, so what could she possibly want now? (Source: Yen Press)

Book 11 of the Seishun Buta Yarou series. A miniskirt-wearing Santa appears before Sakuta, calling herself Touko Kirishima and cheerfully informing him that she’s been handing out presents—Adolescence Syndrome. Apparently, 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 first hand when he spots her saving someone. And then a poltergeist suddenly attacks, and this is somehow his fault?! Solving all this might require delving into Sakuta’s unpleasant past... (Source: Yen Press)