OVA
Description
Sanae Dekomori is a junior high school student who serves loyally as Rikka Takanashi's self-proclaimed servant, a bond formed online two years earlier through shared interests in parallel worlds and chuunibyou. She embraces intense delusions, identifying as the "Agent of the Eye of the Wicked Lord" and wielding her long blonde twintails, weighted with small bags dubbed "Mighty Mjolnir Maul," as weapons. Her distinctive speech frequently ends sentences with the formal copula "-desu," deliberately pronounced to echo the English word "death."

Despite her chuunibyou persona, Dekomori excels academically, particularly in mathematics, where she tops her grade level and has completed the junior high curriculum ahead of schedule. She behaves normally around classmates uninvolved in her delusions, contributing to her popularity. She strongly dislikes milk and dairy products but consumes them regularly hoping to increase her height, while also suffering from pronounced motion sickness.

Her affluent background is indicated by appearances in an upper-class sedan with a butler. Her initial quest focuses on finding the true "Mori Summer," an online figure from her past. She dismisses Shinka Nibutani's claim to this identity, persistently labeling her "Fake Mori Summer" and engaging in frequent conflicts.

Her relationship with Shinka evolves. After an accidental kiss during a drunken incident in an OVA, she blushes intensely and denies any enjoyment. Later, in Season 2, she temporarily acknowledges Shinka as the genuine Mori Summer after Shinka protects her from a stalker. During this event, other characters confirm the OVA kiss was her first kiss. She displays jealousy when witnessing Shinka embraced by another character, protesting the perceived theft. In another OVA, both recognize their constant fighting signifies mutual affection, though they vehemently deny it.

By Season 2, she enters high school as the freshman class representative. Her academic standing remains exceptional, surpassing Shinka's entrance exam scores. In the *Take On Me* movie, she serves as student council president. Under coercion involving a compromising photo threat, she partners with Shinka on a mission. During this assignment, they share a bed and initially demarcate a boundary line. While sleeping, they cross this line, Dekomori ending up hugging Shinka and burying her face in Shinka's chest.

Her development includes moments of vulnerability, such as mistakenly interpreting Rikka's actions as romantic reciprocation before being rejected, requiring comfort from Shinka. She also expresses disappointment when Shinka threatens her during a phone call instead of conveying missing her, revealing underlying emotional expectations. She remains fiercely protective of Rikka and dedicated to their shared delusional pursuits.