Book 4 of the Seishun Buta Yarou series.
 
DOUBLE TROUBLE?!
 
​Sakuta is eager to finally have a chance to spend time with Mai again, but instead, he's greeted by a stranger who looks just like her. Apparently, Adolescence Syndrome is paying Mai another visit and has forced her to swap bodies with Nodoka Toyohama, a flashy up-and-coming idol...who also happens to be Mai's half sister! With no resolution in sight, each sister must pretend to be the other and go about their respective lives as best they can. Trouble is, it seems like Nodoka is preoccupied with something besides walking in Mai's shoes...
 
(Source: Yen Press)

Book 3 of the Seishun Buta Yarou series.
 
SOMETIMES MORE IS JUST CRAZY! 
Just before summer break, Sakuta encounters Shouko Makinohara, a girl in junior high with the same name and face as his first love. Of course, that should be impossible, since she would be in college by now. Then, as if one mystery wasn't bad enough, Adolescence Syndrome strikes again. His impassive friend from the science club, Rio, discovers she has a doppelgänger. One of the Rios is forced out of her house and winds up staying at Sakuta's apartment. Definitely not the girl he expected to find himself living with...And when Mai insists she's going to sleep over, too, Sakuta's summer vacation descends into pure chaos.
 
(Source: Yen Press)

There's a rumor about a mysterious phenomenon called "puberty syndrome." For example, Sakuta Azusagawa is a high school student who suddenly sees a bunny girl appear in front of him. The girl is actually a girl named Mai Sakurajima, who is Sakuta's upperclassman who is also a famous actress who has gone on hiatus from the entertainment industry. For some reason, the people around Mai cannot see her bunny-girl figure. Sakuta sets out to solve this mystery, and as he spends time with Mai, he learns her secret feelings. Other heroines who have "puberty syndrome" start to appear in front of Sakuta. 
(Source: Anime News Network)

Book 5 of the Seishun Buta Yarou series.
 
GUESS WHO’S BACK?
 
​After years without contact, Sakuta has received a letter from his first love, Shouko, asking to meet at Shichirigahama Beach. Of course, now that he’s in a happy relationship, he’s not quite sure how to respond...or how to explain the situation to his girlfriend, Mai. Maybe he’ll just focus on helping his panda-loving, stay-at-home sister achieve her goal of returning to school for the time being. But this is easier said than done, given that she hasn’t left the house for two whole years...
 
(Source: Yen Press)

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