First-year high school student Uka Ishimori wants a fresh start. In middle school, Uka was given the nickname "Rocky" by her peers, being misunderstood as having no emotions when she was actually shy and introverted. As a result, Uka was relentlessly bullied and experienced a lonely, isolated school life. Now, Uka is determined to change. During the first week of school, Uka accidentally gets drenched in lemon soda by her classmate Kai Miura—whose cool personality is the complete opposite of hers. After the incident, Uka is surprised when Kai performs small acts of kindness for her, encouraging her to gradually break out of her shell. Like a lemon soda, bubbly and exciting feelings are beginning to stir.

In order to reclaim everything that is rightfully hers from her uncle, she decided to approach her uncle’s biggest client—Sheng Jun. Initially thinking that everything would go according to her plan, little did she know that Sheng Jun is also carefully crafting his moves and already has her wrapped around his fingers. The two gets trapped in love but both are scared to express their honest feelings to each other, for one wrong step might lead to the point of no return.

Aspiring manga artist Mizuho Nishino has grown alongside her four childhood friends: Kizuki Hazawa, Shuugo Hoshikawa, Shin Kashiwagi, and Airu Izumi. But on Mizuho's 17th birthday, Kizuki suddenly asks to be her boyfriend. Having no previous experience with romance, Mizuho brushes it off easily, but Kizuki is genuine and intends to win her heart. Kizuki no longer hides his affections, and Mizuho hesitates, worried about the consequences their potential relationship could have on their whole friend group. As Mizuho works through the confusion of youth, it seems that the other three boys have fallen for her as well—and she must find a way to sort her feelings out without shattering the close-knit group she holds dear.

Since childhood, Kazuhiro Kitase has been able to dream of a different world. He can return to reality by falling asleep or dying, and he can pick up where he left off by sleeping again. For years, he has had many adventures alongside Mariabelle, a beautiful elf who works for the Sorcery Guild. On one of their escapades, they come across the lair of a dragon taking care of its eggs. They inadvertently wake the slumbering beast, who promptly reduces them to ashes. For Kazuhiro, it is merely a temporary setback, as he can simply go back. However, he is shocked to find Mariabelle herself safe and sound asleep next to him. Kazuhiro realizes that his dream world is an alternate reality altogether. In the meantime, he makes the most of this bizarre circumstance, introducing Mariabelle to the sights and wonders of Japan. Now, with their time together spanning two worlds, their real adventures have just begun!