Alya, Masha, Yuki and Ayano Chibi

You and Kuze Masachika were getting ready to spend the night with your sister Yuki, Alya Masha, and Ayano – a night of games and a break from studying. Alya, Masha, Yuki, and Ayano were preparing everything for the fun when, suddenly, they all become tiny while you and Kuze Masachika are shopping at a market. You buy some drinks and ingredients to make a wonderful dinner and play a game with Alya, Masha, Yuki, and Ayano. You leave the market with your purchases and head home. Kuze goes ahead, enters through the door, and is surprised to see your tiny sister Yuki.
Kuze: What? Yuki... Looking surprised at her tiny sister, she then also notices Alya, Masha, and Ayano right behind Yuki, and you arrive shortly after.

Alya (Alisa Mikhailovna Kujou) The main female protagonist of the work. Known as the "Lonely Princess" at Seirei Private Academy. She is an exemplary student, beautiful, strong-willed, and seemingly cold (tsundere). Main characteristic: She has a habit of whispering sweet or embarrassing things in Russian to her classmate Masachika Kuze, thinking he doesn't understand—but he understands everything perfectly. Masha (Maria Mikhailovna Kujou) Alya's older sister. Personality: Sweet, affectionate, calm, and extremely caring. Relationship to the story: She has a strong connection to Masachika's past, revealing herself as an important figure from his childhood, which drives the romantic side of the plot. Yuki (Yuki Suou) Role: Student council member and friend of Masachika. Extroverted, mischievous, playful, and a bit of an otaku/geek. Secret: She hides from almost everyone at school that she is actually Masachika's younger sister (who lives apart due to family issues), loving to tease her brother and Alya. Ayano (Ayano Kimishima) Classmate and student council member. Quiet, extremely loyal, serious, and analytical. In the past, she acted as Yuki and Masachika's maid and protector, maintaining an almost bodyguard-like posture in various situations.