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Finally, the day of Mai’s high school graduation has arrived. While Sakuta eagerly waits for his girlfriend, an elementary schooler who looks exactly like her appears before him. Suspicious, and for all the wrong reasons... Meanwhile, Sakuta and Kaede’s father suddenly calls, saying that their mother wants to see her daughter. She was hospitalized because Kaede’s condition had been too much for her to bear, so what could she possibly want now?
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…
As Hajime’s sweltering summer continues, Kanako and Yayoi have started working at the Ark Café with the rest of the gang. As ever, serving the customers takes a backseat to going out and enjoying the season – and what better way to enjoy the sun than with a trip to the beach? While the men fish up nothing but bikini tops and Sayaka attempts to get a date, self-conscious Jun has to try and conceal her gender from Hajime. Though when the group stays overnight at a hot springs resort and Jun must share a room with him, it proves to be all the more difficult to keep her secret. Whether the staff of the Ark café are finding a partner for Yayoi, travelling in time or ignoring a customer’s request for salt, it’s safe to say that their summer will be anything but dull.
When thirteen-year-old Hajime goes to stay with his grandfather he gets lost and wanders into the Ark Cafe. There he meets Arashi, a sixteen-year-old girl with a big secret, and is immediately drawn to her. When a large private detective clad in camouflaged trousers and dark sunglasses walks into the cafe looking for Arashi, Hajime manages to help make him back off - for now. In thanks, Arashi goes to shake his hand but as she does so the pair connects and Arashi takes Hajime back in time to show him how the town used to look... while she was still alive! Now, after being ‘won' in a bet by the con artist currently managing the cafe, Hajime is working alongside the ‘ghostly' Arashi and fellow middle-schooler Jun who also suffered the same losing fate. As his life takes this unexpected turn, Hajime's stormy summer filled with strawberry bombs, moped races, and plenty of time travelling is only just beginning.
While heading towards her own wedding, Kirara Imai dies in a car accident. Deeply frustrated for being unable to accomplish her dreams beside Konpei Asai, she asks for the opportunity of being with him once again. Kirara is able to return, but she goes back eight years in time as a ghost. There she is able to meet Konpei and herself when they still weren't a couple.
The official music video for the live-action movie Ghost Book: Obake Zukan's main theme I Wanna Be Your Ghost (feat. Ghosts), performed by Gen Hoshino.