TV-Series
Description
Sanae Dekomori is a third-year junior high student and close online associate of Rikka Takanashi for two years prior to the main events. She displays pronounced *chuunibyou* tendencies, adopting the persona "Mjolnir Hammer" and acting as a devoted, self-proclaimed servant to Rikka, whom she calls "master." Her distinctive look features extremely long blonde twintails, each ending in small weighted bags she terms "Mighty Mjolnir Maul" and incorporates into her delusional combat style. These bags contain candy, following unsatisfactory experiments with cookies. She stands 143 cm (4'8") with a petite physique.

Academically exceptional, particularly in mathematics, Dekomori completed the entire junior high curriculum early and solves high school-level problems effortlessly, earning popularity among classmates. While exhibiting flamboyant *chuunibyou* behavior within her social circle, she switches to a conventional demeanor around peers outside it, demonstrating situational awareness of her delusions.

Originating from an affluent family, evidenced by arrivals in an upper-class sedan with a butler, her online inquiries about parallel worlds a year before the series led to interactions with "Tyrant’s Eye" (Rikka) and "Mori Summer," sparking her dedication to rediscovering them. This quest fuels her persistent denial of Shinka Nibutani’s identity as the real "Mori Summer," leading her to derisively label Shinka "Fake Mori Summer" and instigate frequent conflicts. An accidental kiss with Shinka during a fall in an OVA marks her first kiss.

Her role evolves significantly:
- **Season 1**: She actively supports Rikka’s delusions within the Far Eastern Magic Napping Society of Summer and aids the search for the "Ethereal Horizon." Her antagonism towards Shinka intensifies when she obtains copies of Shinka’s past *chuunibyou* writings for leverage.
- **Season 2**: As a high school freshman and class representative, she achieves the highest entrance exam score in her year—surpassing Shinka—garnering admiration for her academics. Her dynamic with Shinka gradually softens, culminating in reluctant cooperation and mutual concern, like calling for Shinka’s help when distressed.
- **Movie (Take On Me)**: Now student council president, she is coerced by Touka Takanashi, who threatens to publish compromising photos of her with Shinka, into collaborating with Shinka to pursue Rikka and Yuuta across Japan. This role shows a shift towards greater responsibility while maintaining core *chuunibyou* traits.

Notable personal quirks include a strong aversion to milk and dairy products, consumed reluctantly for potential height increase, and susceptibility to motion sickness. Her speech frequently incorporates the formal Japanese copula "-desu" (or interrogative "-desu ka"), deliberately pronounced to resemble the English word "death," often interjecting phrases like "De-de-death!!" during heightened moments as a deliberate pun within her persona.