
Saikin Koi Shiteru? is an otome game created by Microvision and released in Japan in 2009 under the D3Publisher label.
A 17-year-old customizable female protagonist enrolls at Seiran Academy and stumbles into a mysterious pool located just outside the school entrance, where she encounters some… mitochondria? It seems every person she meets has them, but only she can see these tiny companions. She dubs them Saikin (bacteria) and uses them to subtly influence others' emotions—always with… noble intentions.