Love is unusual for Koizumi Risa and Ootani Atsushi, who are both striving to find their ideal partner in high school—172 cm tall Koizumi is much taller than the average girl, and Ootani is much shorter than the average guy at 156 cm. To add to their plights, their crushes fall in love with each other, leaving Koizumi and Ootani comically flustered and heartbroken. To make matters worse, they're even labeled as a comedy duo by their homeroom teacher due to their personalities and the stark difference in their heights, and their classmates even think of their arguments as sketches. Lovely★Complex follows Koizumi and Ootani as they encourage each other in finding love and become close friends. Apart from their ridiculous antics, they soon find out an unexpected similarity in their music and fashion tastes. Maybe they possess a chemistry yet unknown, but could love ever bloom between the mismatched pair?

Seeing everyone else enjoying their youth, socially anxious Renako Amaori is dead set on becoming an extroverted girl. Despite her reclusive past, she changes her appearance, practices conversation, and enrolls in a high school free of anyone that would know her. While she is quickly able to befriend the famous model Mai Ouzuka, after Renako joins her friend group, she realizes pretending to be a completely different person is no easy feat. Soon, Renako and Mai have a heart-to-heart and share their troubles with each other. After the sincere discussion, Renako truly believes they could become best friends. The very next day, however, the unthinkable happens—Mai confesses her love to Renako! Although Renako is not interested in dating, Mai insists the two begin hanging out alternately as friends and a couple, while figuring out which type of relationship suits them better. Determined to create a blissful friendship, Renako tries her best to convince the stubborn Mai. However, Renako herself might have a change of heart as Mai's advances continue to get bolder.

A lot has happened for Nagi Umino and Erika Amano: they were swapped at birth, learned of their engagement, and have started living under the same roof. The two now share their home with Nagi's sister, Sachi, and his crush, Hiro Segawa. Despite this unusual domestic situation and frequent quarreling, the group is beginning to settle into a life together. However, the return of Nagi's childhood friend Ai Mochizuki to Japan complicates things. Ai suddenly declares her intention to marry Nagi, and although he turns her down, she is committed to having him all to herself. Now with four girls around, each with their own thoughts about him, Nagi must figure out his own feelings and the best way forward.

Lua is a saintess candidate who possesses the power of healing. But her ability had one flaw: she could only heal others by transferring their wounds onto herself. Because of this, others bullied her, calling her the "Fallen Saintess." But it didn't bother Lua because her best friend Arianne always stood up for her. One day, Lua's crush, Commander Garrett, was on the brink of death from a beast attack. Lua healed him, which left her on the verge of death. When she woke up, she learned that all the credit was given to Arianne, and she finally saw her best friend's true color. Devastated, Lua is lost and helpless when the second prince appears in front of her with a tempting offer. What would happen to Lua as she begins her new life as a villainess?