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)

Book 2 of the Seishun Buta Yarou series.
 
How far can a fake relationship go?
 
Mai is no longer invisible--she's acting again, and she finally said yes when Sakuta asked her out for the millionth time. Life couldn't be better for Sakuta...until he wakes up and finds himself reliving the morning before she agreed to date him!
 
Assuming this weird time slip to be another case of Adolescence Syndrome, Sakuta begins searching for clues and stumbles upon the first-year Tomoe. Though the last time they saw each other involved getting kicked in the butt, now she's desperately trying to avoid getting asked out by the boy her friend is crushing on so she won't be ostracized. One ruse leads to another, and soon news spreads that Sakuta is Tomoe's boyfriend. Now how is he going to explain this to Mai...?
 
(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 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)

“For the past three days, there have been two Rio Futabas.” After successfully breaking the time loop that he and Koga were trapped in, Sakuta’s threshold for what qualifies as “odd” was higher than most. So seeing his friend Futaba in a net café late at night should have been downright unremarkable—if he wasn’t already on the phone with another Futaba…The ever-logical second-year has a doppelgänger, and neither one can (or will) explain what’s caused this sudden case of Adolescence Syndrome. With one of the Futabas staying at his place, Sakuta will have to work fast in order to solve this. After all, who knows what could happen if the two doppelgängers meet?"
 
(Source: Yen Press)
 
Note: Includes the prologue.

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