Episodes (13)
The Secret Life of a Stepsister
After his father remarries, Kouta is introduced to his new stepsister, Aika, and the two immediately clash. However, the dynamic shifts when Kouta discovers Aika's hidden double life, as she frequently brings boys over to her room in secret while their parents are away.
The Bratty Sister's Secret
After his father remarries, Kouta Takamura is introduced to his new stepsister, Aika, and the two immediately clash, forming a mutual dislike. However, as they begin living together, Kouta discovers that Aika has a secret life of bringing boys over to her room whenever their parents are away. To keep her mother from finding out, Aika threatens Kouta, establishing a tense and complicated relationship between the new siblings.
The Buzzkill Brother
Aika's intimate encounter with Takahashi is interrupted by her brother, Kouta, who is annoyed by the noise. After scolding Takahashi and buying condoms to ensure Aika's safety, Kouta effectively ends the tryst. In the aftermath, the two bicker, leading to the revelation that they are not biologically related.
The Secret Side of a Model Child
The brother confronts Aika about her double life, noting the stark contrast between her persona as a model daughter and her rebellious, provocative behavior in private. Their tense encounter in the bathroom is nearly exposed when their mother returns home unexpectedly, forcing the two to scramble to keep their interaction a secret.
Midnight Ramen and Mixed Signals
Following a surprising encounter that leaves Aika questioning Kouta's lack of ulterior motives, the two share a late-night meal of instant ramen. Through a series of playful demands and bratty banter, Aika is forced to acknowledge Kouta as her brother in exchange for a bite of his food. This rare moment of gratitude leaves Kouta wondering if Aika's prickly attitude toward him is finally starting to soften.
A Heroic Rescue
When a man attempts to force himself on Aika against her will, Kouta steps in to rescue her and drive the assailant away. Following the incident, Aika lets her guard down and shows a rare side of gratitude toward her brother, leading to an unexpectedly tender moment between the two.
A Risky Encounter and a Clumsy Lie
Aika seduces Kouta into an intimate encounter, but their tryst is abruptly interrupted. Forced to explain the damage to the house, Aika concocts a ridiculous story about practicing self-defense. Despite the obvious flaws in her excuse, the situation is resolved when their family member decides to overlook the incident for the sake of family harmony.
A Brother's Resolve
With their parents out for the evening, Aika attempts to seduce Kouta to continue their intimate encounter from the previous day. However, Kouta stops himself at the last moment, explaining that he wants to truly understand Aika and love her sincerely before crossing the line. While Aika teases him for his innocence, Kouta's resolve reveals a deeper emotional connection between the siblings.
Temptations at the Hot Sea
During a family vacation to Atami, Kouta and Aika are left alone, providing the bratty sister with the perfect opportunity to push her brother's boundaries. Aika's bold provocations lead to a heated encounter that is only interrupted by the call for dinner, while the parents share a tender moment reflecting on the happiness of their newly formed family.
Beach Day Blunders
Kouta is tasked with guarding Aika during a trip to the beach, where Aika claims he is her boyfriend to ward off a persistent pickup artist. This leads to Aika teasing Kouta with provocative behavior until a wave washes away her swimsuit. In a panic, Aika forces Kouta to give up his own underwear to cover herself, leaving him exhausted by her bratty demands.
The Half-Measure Compromise
Following their family trip, Aika begins spending more time in Kouta's room, eventually pressuring him into sexual intimacy. Kouta attempts to set boundaries by suggesting a compromise that excludes penetration, but the resulting tension only makes the experience more intense and agonizing for him. Their risky encounter is interrupted when their father unexpectedly returns home.
Hidden Tears
After Aika lures Kouta to an abandoned building to seduce him, Kouta resists her advances and questions her desperate need for sexual validation. This confrontation leads to a rare moment of vulnerability for Aika, who breaks down in tears after a gentle gesture from Kouta, hinting at deeper emotional wounds beneath her provocative behavior.
Unveiling the Past
While sharing an intimate moment in the bath, Aika opens up to Kouta about the traumatic event from her past that shaped her current behavior and fear of loneliness. Kouta's compassionate and non-judgmental response provides Aika with emotional validation, deepening the bond between them.
