Sohara Mitsuki, Tomoki Sakurai's childhood friend and neighbor, balances a caring nature with a no-nonsense attitude. She faithfully rouses Tomoki each morning and accompanies him to school, often deploying her signature "Sohara Chop"—a karate strike of comedic magnitude—to curb his antics. Her exaggerated strength transforms simple discipline into slapstick spectacle, shockwaves rippling from her strikes or cleanly severing bamboo.

Childhood frailty confined her to solitude, with Tomoki's steadfast kindness forging their unshakable bond. This history anchors her silent devotion, though unspoken feelings simmer beneath surface-level exasperation, occasionally flaring into jealousy toward Tomoki's Angeloid housemates. Her culinary ventures—particularly weaponized fried eggs—defy all edible logic, surviving characters treating each meal as a mortal threat.

A seismic twist reveals Sohara as Daedalus' creation—a Synapse-engineered clone replacing the original claimed by childhood illness. The true Sohara perished young, compelling Daedalus to craft a mirror-image replica preserving her essence for Tomoki's sake. Though unaware of her synthetic genesis, the clone embodies every memory and mannerism, her humanity unquestioned until truth surfaces.

Story arcs test her limits—snowball battles become demolition derbies under her strength, accidental time travel to her sickly past tightening bonds with Tomoki. Despite artificial origins, her compassion and yearning for ordinary life anchor the narrative's whimsy in heartfelt authenticity.