Izumi Asagi is a spirited high school student at Satsukibashi High, radiating energy and optimism. Embracing the title of "otaku-in-training," she actively explores niche subcultures while forging bonds with peers effortlessly. Her days revolve around playful escapades, caring for her beloved dogs, and sidestepping mundane routines. She stands 160 cm tall, weighs 52 kg, and sports a pink-themed aesthetic with body measurements of 85/62/86 cm.

Hailing from a dystopian Akihabara, she works at Rabbit Hut Headquarters—a café-turned-stronghold in a world where otaku culture faces erasure by a memory-wiping virus. Partnering with allies, she ventures into corrupted fictional dimensions to purge infections, rebuild fractured storylines, and shield humanity’s shared memories of anime and manga. This mission mirrors her tenacity and resolve to defend cultural legacies.

Her name, blending "fountain" (泉) and "water" (水), and her surname, merging "shallow" (浅) with "tree" (木), reflect her vibrant essence. Her loyalty to the café’s mission traces back to childhood ties with its manager, cementing her lifelong role in their struggle. The narrative centers on these core elements, omitting expansions into alternate media within existing records.