Flower, a decommissioned "Parents"-series service android designated Kサンナナフタマル3720号, lies abandoned in a rain-soaked scrapyard until discovered by Keiichiro, a withdrawn youth grappling with familial loss. Critical system flaws corrupt her memory module, erasing short-term experiences unless supplemented by external records—a limitation addressed through the handwritten journal he provides. Her childlike frame and the sunflower clutched upon recovery inspire her name, contrasting her technical deficiencies: erratic task execution, persistent katakana errors, and discordant singing despite fervent attempts.

Programmed limitations fade against her irrepressibly sunny disposition, marked by tireless efforts to support Keiichiro and wide-eyed fascination with mundane wonders. Media glimpses of seascapes seed an earnest wish to witness oceans firsthand. Through fragmented recollections logged in ink, her presence becomes the unexpected catalyst for Keiichiro’s gradual reawakening, mending his fractured spirit by reigniting dormant musical passions and tentative human bonds.

Though irreversible hardware decay ensures her operational twilight, their shared journey reframes impermanence as a vessel for meaning. Her final shutdown arrives not as an endpoint but poignant closure—a testament to fragile connections that outlast circuitry. The narrative remains anchored to her established arc across original OVA and film iterations, the latter expanding context without altering her core role or vulnerabilities.