喜歡孤獨的大學三年級生櫻井真以，不和同學群聚，總是獨自吃飯。在暖洋洋的陽光中，獨自在學園內的長椅睡午覺，過著非常幸福的學園生活。然而，某一天突然，低一年級的後輩，宇崎花出現了，櫻井的孤獨樂園開始崩塌。瞧不起孤獨的人，玩弄男人的內心，更橫奪炸雞塊？！本應過著平穩的學園生活的櫻井，出現了戀愛的？免費的？煩人又可愛的暴風雨的預感！

櫻井在咖啡店打工。店內有著讓人心平氣和的咖啡香味、時髦的老闆、成熟的氛圍。櫻井格外喜歡這平靜的地方，然而宇崎學妹卻突然出現了。笑聲和怒吼聲讓店裡的沉靜變得喧鬧。櫻井在上學路上被附近的居民誤解對宇崎學妹做了無恥行為，在學校食堂被人懷疑孤僻，還在咖啡店幫宇崎學妹完成調查報告，然而時髦的老闆卻偷偷地樂在其中。

咖啡店老闆的女兒·亞實偷偷地觀察櫻井打工的姿態。然而宇崎學妹卻精神飽滿地出現在那裡。看見關係如同水和油般的兩人，亞實對其更感興趣了。其中，櫻井由於被宇崎學妹撞倒淋了一身濕而發高燒臥床不起，於是宇崎學妹便去探望。因此，櫻井很快就恢復了。為了慶祝恢復健康，亞實、老闆、櫻井和宇崎一起去烤肉店。然而父女倆十分在意他們兩人的關係。

黃金周櫻井獨自在家裡玩電視游戲。就在此時，突然出現的宇崎學妹邀請他去公園找哆啦夢GO的怪獸。由於連日玩游戲，櫻井的眼睛很不舒服。於是兩人打算去買PC用眼鏡。偶然碰見的亞實打算一起給櫻井挑眼鏡，但卻以眼鏡搞笑大會而告終。櫻井和宇崎學妹再次參加怪獸大量出現的活動，然而在滿員電車裡，宇崎和櫻井緊貼在一起，櫻井的命運將會……

櫻井上課時做了從高處掉下的夢而突然嚇醒，宇崎因此笑個不停。此時，櫻井在學校裡久違地碰到了同級的榊󠄀。櫻井不顧希望櫻井幸福的榊󠄀我行我素地生活，對此榊󠄀感到焦急不已。就在這時，宇崎出現了。榊󠄀懷疑兩人的關系，但被他們否定了。即便如此榊󠄀還是滿懷期待。亞實在食堂角落盯著榊󠄀。

宇崎學妹也開始在櫻井打工的地方打工了。櫻井宣言道：“暑假就呆在家裡玩游戲”，宇崎卻把他拉去海邊游泳。榊󠄀和亞實也跟著去了。櫻井認真游泳被亞實罵、敲西瓜被宇崎捉弄、在晚上試膽因為太害怕而崩潰。四人在榊󠄀的別墅居住，然而晚上，櫻井在玩游戲的宇崎旁邊睡著了，如此的兩人會發生什麼？

櫻井受宇崎學妹邀請第一次去貓咖啡店。回家時，宇崎告訴櫻井她二十歲生日快到了。煩惱的櫻井於生日當天街上找生日禮物。此時，宇崎聯系他去居酒屋。第一次品嘗酒和下酒菜而感到異常興奮，不懂節奏的宇崎不斷大吃大喝。最後，櫻井決定讓錯過末班車的宇崎到他家裡住一晚。

自從喝醉把櫻井的被子弄髒以後，宇崎學妹變得毫無生氣。對此在意的櫻井，在老闆和亞實的安排下決定邀請宇崎去煙花大會。櫻井為了給笨拙的宇崎打氣而不斷稱贊她的浴衣可愛。宇崎逐漸恢復了精神，然而由於意外的事情櫻井暈了過去。在夢中，櫻井想起了高中時代和宇崎一起的某天。隨後，櫻井在宇崎的大腿上醒來，和那天相似的煙花在兩人眼前綻放。

宇崎學妹弄髒被子的賠償多了，於是櫻井把剩下的錢送到宇崎家。宇崎學妹的母親月出來迎接，看到櫻井銳利的眼神感到可怕。櫻井不斷給月帶來誤解。接著日後，櫻井玩游戲輸給宇崎後信口說了句“明明你母親很文雅”，這讓宇崎十分不悅。第二天，宇崎在打工時故意變得文雅，給周圍帶來麻煩。

櫻井和宇崎降落到了鳥取沙丘柯南機場。偶然，與亞實、榊󠄀匯合，並一起巡遊觀光地。櫻井和宇崎在鳥取沙丘賽跑，宇崎在圓形劇場給櫻井大量特產，並在白兔神社搶奪櫻井的兔子燒。亞實和榊󠄀一邊隱藏鳥取的真相一邊讓櫻井和宇崎去游泳，然而知道真相的兩人決定將錯就錯，愉快地玩到最後。

櫻井打算清理堆在房間裡的宇崎的私物，並開始對她說教，但宇崎親手做的菜讓他鎮靜下來。櫻井在老闆的建議下，試著去做菜，然而結果很糟糕。於是他拜託宇崎的母親開展特訓。某天，櫻井和宇崎參加攀岩體驗課程，面對櫻井認真的樣子，宇崎想起了高中時代的他。

暑假到了尾聲，一天，櫻井帶著閃了腰的老闆去醫院時，宇崎對亞實說起了和櫻井的高中時代的話題。過程中，宇崎被亞實指出了未曾意識到的習慣而臉紅不已。日後，宇崎突然想看前輩喝醉的樣子，在榊󠄀的建議下她打算喝櫻井的公寓裡暢飲。

因為暑假結束了，宇崎醬變得心情很不好。然而當櫻井出現時，宇崎醬突然興奮起來！仁熱情地看著他們，並建議他們去打保齡球時，宇崎像往常一樣向櫻井挑戰。如果你輸了，你必須聽贏家怎麼說！櫻井能戰勝宇崎的干擾嗎？！有一天，亞實打算更新咖啡廳的制服，宇崎醬穿上各種制服（？）……？

大家決定一起去玩。亞實期待著宇崎和櫻井的心跳的突發事件。和亞實一起購物的時候，宇崎突然說想看泳裝。好像最近和櫻井發生了什麼事……?

學園祭的季節終於來了！

――不過，櫻井打算在這段時間待在家裡玩遊戲。

對櫻井讚嘆不已的宇崎醬居然願意搭理他。

從協助學園祭實行委員會的坂木那裡聽說集郵集會的事後，

兩人決定去學園祭尋找華麗的獎品。

宇崎醬從學園祭的占卜結果中確信櫻井喜歡她。

滿臉得意地向阿美和坂木說明了情況，但宇崎醬似乎被嚇壞了，似乎有些不對勁……

Hana is upset that Shinichi calls other women by their first name but not her. Shinichi gets a coupon for a gym's free trial, and meets a trainer named Fujio. At the Uzaki household, it is revealed that Fujio is none other than Hana's father. He calls a family meeting when he finds out that her senpai, who he had assumed was a girl, is in fact a guy. The situation escalates when Hana defends Shinichi to her father and younger siblings. Kiri is dismayed to learn that the maker of the udon he had enjoyed is male, while Yanagi is highly amused by it all. Meanwhile, Shinichi tries to sweat out his Hana-induced inner turmoil.

At the gym, Fujio shares his worries with Shinichi and two other regulars about his daughter having a boyfriend. Since Shinichi spends so much time training, Hana feels neglected by him and reiterates that he is the one who likes her in response to Yanagi's teasing. The next day, still under the delusion that Shinichi has feelings for her, Tsuki spends time at the café and leaves him alone with Hana for his cooking lesson, in the hopes their relationship develops. Later, she bumps into him on her way back home and erroneously believes he and Hana had sex. On November 29, Hana spends time with Shinichi for his 21st birthday and he privately acknowledges she is special to him. Meanwhile, she realizes he will graduate from college in a little over a year, and requests he do something outrageous.

Hana is worried she will not be able to hang out with Shinichi once he graduates from college. Since she is adamantly convinced that he likes her, and not the other way around, she plots to make him confess his feelings to her. She cooks him lunch, which attracts the interest of her whole family. After Hana refuses to introduce her to Shinichi, Yanagi visits the café.

Hana has a meltdown at the café because Shinichi does not call her by her first name, although he does with other people and he called Yanagi by her first name not ten minutes after they met. Back home, Yanagi tells her mother about her meeting with Shinichi, making Tsuki spiral down into further misunderstandings. Kiri is stressed studying for exams and lack of physical activity. As such, he goes to exercise at the gym where his father works to cheer himself up. However, when Shinichi also shows up, Kiri ends up feeling completely outclassed.

The Uzaki family go to a hotsprings resort, minus Kiri who is still traumatized after running into Shinichi. Fujio reminisces of the days when Hana was a child, and soon after arriving at the resort chases off guys hitting on Hana and Yanagi, and then Tsuki. He then gets surrounded by young men admiring his physique, which turns into a photoshoot as he basks in the attention. While the cat gets training from the resort's mascot, Hana goes wandering and runs into Shinichi and Sakaki. She offers to hang out with them but Shinichi tells her to spend time with her family. As they part, Hana gets Shinichi to compliment her bathing suit. Back to the Uzaki household, Kiri regrets not having joined his family's outing, while a now buff cat scares a bunch of the neighborhood's kitties.

Tensions are high between Sakurai and Hana as the lovers' holiday of Christmas approaches. Sakurai gets a shock when he touches base with his family.

Hana reminisces about high school with Sakurai while his father warns him about their relationship. Sakurai gets solid advice from an unlikely source.

It's Christmas Eve, and Hana finds a way to spend it with Sakurai at her home. He's introduced to her father Fujio, who knows him from somewhere...

Christmas Eve at the Uzaki house comes to a confusing end for just about everyone involved, leading Sakurai to reexamine his feelings for his junior.