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"Forget what you saw today." There's something odd about Sakuta Azusagawa, an acerbic, standoffish high schooler who doesn't even own a cell phone in this day and age. And perhaps strange things happen to strange people, which is why on the last day of the Golden Week holiday, in a tranquil library, he meets a wild bunny girl. With that unforgettable encounter, their bizarre and mysterious love story begins.
"There is another 'me' in this world". Futaba Rio from the science club turned into two person for some mysterious reason. Sakuta hid one of them in his house, not only that, Sakurajima senpai said she would move into his house as well. Sakuta's vacation was completely messed up "I hate myself" What's the pain in Rio's heart?
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.