TV-Series
Description
Michiru Matsushima is a second-year student at Mihama Academy, a school for students with difficult personal histories. She presents herself as a lively, energetic, and deliberately exaggerated tsundere type, with bleached-blond twin tails and a habit of carrying a shark-shaped pouch filled with lemonade sweets. This bubbly, silly persona makes her the mood maker of the class, but it is a carefully constructed facade. Underneath the comedy lies a deep and painful past.

Born into a wealthy family, Michiru was expected to excel academically and artistically, especially in piano. Private tutors were hired to train her, but they bullied and abused her behind her parents' backs. Her parents, believing she was simply unintelligent, did not intervene as long as she remained physically healthy. When Michiru developed a heart condition, she lost all value in their eyes; they withdrew their attention and tried to have another child. This neglect plunged her into a severe depression where she would sit motionless in her room for days.

Her turning point came when she encountered a girl about to jump from the school roof. Michiru, envious of the girl’s resolve, inadvertently talked her down, and the two became close friends. However, that friend later completed her suicide in front of Michiru. The shock triggered a life-threatening cardiac crisis, and Michiru required a heart transplant. The donated heart came from a paralyzed American girl who had been in a traffic accident. This donor’s consciousness manifested as an "other Michiru"—a confident, sociable, and intelligent personality that emerged during times of distress. This alter ego tried to help but only intensified Michiru’s sense of invasion, leading her to attempt suicide in order to expel it.

After that incident, Michiru was placed in a mental institution. There, she was given medication to suppress the other personality, and she discovered a new purpose: making people laugh. She decided that if she could bring joy to others, her existence would have meaning. To accomplish this, she crafted a clumsy, genki tsundere identity—an exaggerated, silly, and occasionally theatrical demeanor designed to entertain and lighten the mood. Upon release, she enrolled at Mihama Academy, where she continues to use humor as both a shield and a calling.

Her core motivation is to be useful to others by spreading laughter, a direct response to her own isolation and worthlessness. This drive sometimes leads her to overdo things or take on more than she can handle. She is academically poor, but she remains determined to improve, even forcing herself to drink pure vitamin C despite hating sour foods, believing it will boost her intelligence. Her bad luck streak has followed her since birth, but she always manages to persevere through sheer stubbornness.

In the story, Michiru’s role is both comic relief and a character with one of the most harrowing backstories among the heroines. Her forced cheerfulness masks a fragile psyche and a deep fear of being alone or rejected. Key relationships include the classmates at Mihama Academy, who gradually come to understand her true self, and Yuuji Kazami, the protagonist, who offers her a chance to truly live rather than merely exist. The "other Michiru" remains a constant internal presence, a source of identity conflict that forces her to confront the boundaries between her own will and the influence of her donor.

Notable abilities are more emotional and relational than physical. Michiru possesses a sharp awareness of others’ feelings, developed through her own suffering. She can read a room and knows how to defuse tension with a well-timed joke. In her own arc, she learns to accept both her own weakness and the strength of the other personality, integrating her experiences into a more complete sense of self. Her signature item, the shark pouch filled with sweets, is a small comfort from her past that she carries into her new life.

Overall, Michiru Matsushima is a character who hides immense trauma behind a deliberately constructed smile, using humor to survive and to connect. Her journey is one of reconciling her painful history, her multiple selves, and her desire to bring happiness to others, finally learning that true belonging does not require performance.