Eiji Kitahama has a dream shared by many high school guys: to be popular and have a harem of girls fawning over him. Luckily for him, his new junior in the drama club, Rin Nanakura, has decided to help him realize this wish. Using her impressive acting abilities, she takes on many personalities, from teasing to calm and collected, to play characters in Eiji's simulated harem. As her connection with Eiji deepens, Rin expands her repertoire, quickly swapping between characters while enjoying high school life together in the club. Through her acting, the real Rin Nanakura tries her best to win Eiji's heart.

Seirei Academy is a prestigious school attended by the very best students in Japan. Alisa Mikhailovna Alya Kujou, the half-Russian and half-Japanese treasurer of the school's student council, is known for her intelligence, stunning looks, and rigid personality. Contrasting her near-flawless persona, Alya's unmotivated classmate Masachika Kuze slacks off during lessons and seems to show no interest in her. Initially irritated, Alya gradually becomes more intrigued by Masachika and starts expressing her affection for him in Russian. However, she is oblivious to his secret—he understands the language fluently! Due to a childhood friend who was temporarily staying in Japan, Masachika has been studying Russian in hopes of reuniting with her. As the two spend more time together, the playful and eccentric relationship between them quickly deepens. In the meantime, both must learn to navigate their new growing feelings for one another.

Torako Koshi is the epitome of perfection. With her peerless beauty, top-notch grades, and position as student council president, her popularity in school is unrivaled. However, she harbors a dark secret—she was a delinquent back in middle school—and this is something she conceals to the best of her abilities. Unfortunately, when she meets the mysterious deer girl Noko Shikanoko, Torako's hidden shame is constantly on the precipice of being exposed due to Shikanoko's rather weird antics. To maintain the reputation she worked so hard for, Torako must go along with Shikanoko's whims, even going so far as to become president of the newly established Deer Club. All her efforts will be rewarded if she can prevent the menacing doe from accidentally blurting out damaging details about her personal history that will undoubtedly unleash Torako's greatest nightmare.

Due to a careless mistake, god of wind Silphyleel unintentionally kills a 28-year-old man named Takumi Kayano. Unfortunately, Silphyleel cannot return Takumi to Earth. Instead, the deity reincarnates Takumi into the fantasy world of Etelldia. Equipped with an assortment of magical powers and bottomless inventory, Takumi spawns in the Forest of Gaia, where high-level monsters roam free. There, he meets five-year-old twins who, despite the dangerous environment, are still alive thanks in part to their extraordinary physical strength. Takumi decides to take them under his wing, naming them Allen and Elena. As the trio embarks on their grand adventure in Etelldia, their very existence may impact the world's destiny.