Darkness of the Sea, Shadow of the Moon

In a tale woven with intrigue and dark romance, Ruka and Rumi Kobayakawa, inseparable twin sisters, find their bond tested by their shared affection for the charismatic upperclassman, Katsuyuki Touma. Initially, Rumi appears to champion Ruka's budding relationship with him, but everything changes when a mysterious bacterium infects both sisters. This unsettling event alters Rumi's demeanor and grants them both formidable psychic abilities, setting off a chain of events that will challenge their relationship in unimaginable ways.

As Rumi's obsession with Katsuyuki intensifies, her newfound powers become a dangerous weapon in her quest to eliminate any obstacles—including her own sister. The delicate balance of loyalty and rivalry shifts, plunging the twins into a harrowing struggle where love, jealousy, and supernatural forces collide, exploring the depths of their connection in a world shrouded in darkness and desire.