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)

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WHAT WILL IT TAKE TO MAKE HER WISH COME TRUE? 
 
After a draining December, Sakuta is quickly nearing the end of his second year of high school. Since Mai is a third-year student, they don’t have much time left together before graduation rolls around. Meanwhile, his sister, Kaede, is slowly but steadily venturing outdoors again. Just as she begins to find her footing, she announces her most ambitious goal yet—attending her brother’s high school! Sakuta knows better than anyone how difficult this will be for Kaede, and he’s ready to support her however he can. He’s just not sure if that’s what’s best for her…or what she really wants… 
 
(Source: Yen Press)

March begins, and there is only one month left in the third term. Sakuta Azusagawa is about to celebrate the graduation of his girlfriend Mai Sakurajima. As he waits for Mai at Shichirigahama beach, an elementary school-aged girl who looks like Mai did when she was a child actress appears in front of him. While reflecting on this mysterious encounter, he receives a phone call from his father. Kaede’s mother never came to terms with what happened to Kaede. Having been hospitalized for so long, their mother finally wants to see her daughter. To fulfill their mother’s wish, Sakuta makes the decision to meet face-to-face–something they haven’t done in a long time. He’s unable to hide his nervousness about all this. Never-before-seen scars begin to appear on Sakuta’s body. Could these be warning signs of a new type of puberty syndrome? 
(Source: Fathom Events)

Sakuta's shut-in sister, Kaede, has been content always being at home after the bullying incident that put her there. Plus, that's where her favorite onii-chan is! Yet, slowly but surely, Kaede's feelings are beginning to change as she looks to the world beyond the four walls of her home.
 
(Source: Yen Press)

Azusagawa no Chichi