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)

Book 1 of the Seishun Buta Yarou series.
 
Out of sight, out of mind! Bunny girls do not live in libraries. This is simply common sense. And yet, that's exactly where Sakuta finds one in the wild. More bewildering is who the bunny girl is: Mai Sakurajima, a girl one year older than Sakuta, famous at their school for her acting career even though she's currently on break. To top it all off, it seems like no one else in the library can see Mai at all, no matter what she does or...wears. Wanting to find out more about this mystery and maybe get a little closer to this beautiful upperclassman in the process, Sakuta launches an investigation to discover why an unforgettable bunny girl keeps becoming totally invisible.
 
(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 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)

Sakuta may have cured Mai's Adolescence Syndrome in the nick of time, but now he faces a no less harrowing task-convincing her to officially date him. After managing to win that round of verbal fencing, he gets some well-deserved rest...only to wake up "yesterday," with all his progress reset. This inexplicable phenomenon seems to be centered on Tomoe Koga, and the only cure is to...pretend to be her boyfriend?!
 
(Source: Yen Press)

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