Description
Sako embodies the Finnish SAKO Rk 95 Tp assault rifle, commercially designated M95 under the Valmet brand. She arrives at Seishou Academy's middle school as a transfer student alongside Galil. Her appearance features distinctive elf-like ears nodding to Finnish myth, red eyes, a tall frame suggesting dominance, and very long hair with a single left-side braid decorated by a white sunflower. She wears a modified uniform: the academy top with a uniquely tied ribbon, a longer skirt, and high-top combat boots believed carried over from her prior school.

Her personality is controlling, sadistic, and intensely driven to dominate, specifically aiming to become the alpha at Seishou. This manifests in ruthless tactics during the mock battle tournament, where she schemes to humiliate top students like Ichiroku using pragmatic, underhanded methods. These include deploying fragmented rounds to blind opponents, exploiting allies for advantage, and persistently attacking defeated foes like Funco even after victory. Combat triggers her sadomasochism, arousing her through violence; she fondles herself behind cover during jungle wargames after witnessing Funco's ferocity and again after repeatedly shooting Funco. This arousal is particularly linked to Funco, whom she terms "My Cute Adorable Little Bunny".

Her dynamic with Funco evolves significantly. Initially targeting Funco's team, Sako develops a villainous crush that fixates after observing Funco's combat prowess. After the mock battle, Sako departs the school but first forcibly takes Funco's first kiss, asserting ownership. This attraction stems from an "in love with your carnage" dynamic, Sako captivated by Funco's aggressive capabilities.

In the anime adaptation, Sako unexpectedly returns during the finale to aid Seishou against an external threat, intervening to save Ichiroku and Sig from a pincer attack. This contrasts with her manga departure, where she does not reappear. Her anime return substitutes for Galil's role from the source material.

Her background as the RK 95 TP informs her traits: the rifle's reputation for exceptional cold-weather reliability and accuracy mirrors her competitive drive, while its limited production run (20,000 units) and specialized Finnish service reflect her elitism. The 5.56mm NATO export variant's diminished performance may parallel her transfer-student status and non-standard appearance.