Akane Kusunoki is an adult woman distinguished by purple hair reaching chest-length and striking pink eyes. Her attire includes a mini skirt and a necklace. She is the twin sister of Tomoe Kusunoki.

Akane's story begins when a misdirected email sparks a secret sexual relationship with Minoru Kusunoki. Their hidden connection shatters when Minoru, returning from shopping with Tomoe, encounters Akane. Witnessing her twin, Tomoe reacts with grave intensity. Minoru immediately recognizes the profound resemblance, confirming their twin bond. This revelation creates a forbidden dynamic between Akane, Minoru, and Tomoe. The initial shock and uncertainty surrounding their situation escalates into anger, ultimately shifting towards a complex acceptance shared among all three.