Episode 4 of Chastity High unfolds with a surprise visit from Ichico's mother, Chihiro, gracing the school halls for a class observation. Her eyes gleam with pride as she witnesses Ichico confidently helm a presentation alongside her peers, her voice ringing with assurance. However, Ichico's heart races with anxiety as Chihiro inquires to meet her teacher, seeking clarity on a scholarship rumor that Ichico had concocted.
Just as Ichico's world threatens to unravel, Ryougo deftly intervenes, weaving a tale that the teacher is absent for the day, averting imminent exposure. As Chihiro departs, her path crosses with Mrs. Maki, and the two women engage in a lively chat, only to be joined by an unexpected acquaintance – Mrs. Kanda, Atsushi's mother. Chihiro's expression flickers with shock at the sight, but they exchange cordial greetings before parting ways.
Ryougo pulls Ichico aside, revealing that their approach to the Love Keeper gig had been misguided. He insists that embracing a more supportive stance, offering refuge from suspension rather than coercion, would resonate deeply with the students. This shift in strategy proves fruitful, as the students now embrace paying the Love Keepers with a sense of security, relieved that their secrets remain intact.
Ichico thrives in her dual roles, diligently working to pay off her mother's debts while Asuka observes Ryougo's unusual buoyancy, suspecting a romantic entanglement. Ichico presents her mother with a lipstick gift, and Chihiro's admiration is palpable as she notes how well Ichico looks alongside Ryougo, harboring wishes for her daughter to experience love's sweet embrace someday.
Meanwhile, Sawa and the student council members adopt a stringent posture towards suspected couples, their actions tinged with aggression. Ichico, sensing a deeper motive, questions Sawa's behavior, but the latter deflects, claiming Ikushima's directive as the impetus. The council convenes to strategize for the upcoming school trip, amidst a growing buzz surrounding the Love Keeper phenomenon.
Rumors about the Love Keeper spread rapidly, like wildfire consuming the school's whispers. Ichico, overhearing unflattering gossip, confronts Ryougo about stemming the tide of negativity. Just then, a message arrives from a couple hailing from devout families, beseeching for their image's removal from the Love Keeper's grasp, their finances unable to match the demanded price.
Ryougo graciously proposes to assist the couple without compensation, yet Ichico, ever the pragmatist, deems it an unsuitable course for their burgeoning enterprise. Meanwhile, amidst his customary counseling session with Yuki, Asuka confides in her about the enigmatic realm of love, seeking guidance. Yuki's wise words dawn a revelation upon him—he realizes that he harbors feelings for his own teacher.
Elsewhere, Haruto's secret contacts with Ayami continue unabated and are shrouded in secrecy. The school board held a meeting with Ikushima and issued a stern warning over her frequent dismissals, which it said had adversely affected the school's reputation. They believe such behavior undermines their operations, but Ikushima stands firm, arguing that following the rules is crucial, especially when female students contribute more to school coffers. She stressed the need to safeguard the welfare of girls. The trustee issued a stern ultimatum, threatening that if Ikishima continued this practice, she would have difficulty claiming her copyright.
Unbeknownst to them, Ryougo stumbles upon Haruto and Ayami's illicit rendezvous in the upstairs library, the discovery leaving him thunderstruck. Determined to confront his brother, the confrontation escalates into a heated altercation, only to be abruptly halted by Mr. Maki's intervention, labeling Ryougo a disappointment. Dejected, Ryougo retreats to the Love Keeper's sanctuary, where Ichico awaits.
With guarded vulnerability, Ryougo unveils the veil of his troubled past—his father's abuse towards his mother and his subsequent exclusion from the Maki family's fortune. He confesses his ambition to accumulate wealth, yearning to emancipate his mother and embark on a new life overseas. Ichico, deeply moved, extends an olive branch, inviting Ryougo into her home.
Over tea and shared stories, Ichico reveals her mother's aspirations for her to excel in the prestigious academy. A bond forms between them, and Ichico, moved by compassion, revisits her stance, offering to assist the couple gratis. In the solitude of her thoughts, Ichico ponders the possibility of her own heart entwining with Ryougo's.
As the students embark on a school excursion, fate intertwines Atsushi and Ichico, pairing them unexpectedly. Concurrently, Mrs. Kanda seeks out Chihiro at her workplace, humbly apologizing for her indiscretion with Chihiro's husband, seeking to mend fences amidst the aftermath.
Mrs. Kanda divulges with a hint of anxiety that her son, Atsushi, is Ichico's classmate, and confesses her concerns for the latter. She shares with Chihiro the tumultuous relationship she now shares with Atsushi, who's struggled with boundaries and has been bitterly resentful since the revelation of her infidelity. During the excursion, Atsushi attempts to reconnect with Ichico, only to discover that she doesn't recall their youthful encounters.
Meanwhile, Sawa's obsession with catching amorous couples reaches fever pitch, attempting to dictate Yuma's actions, but Ruka valiantly stands by his side. As the evening unfolds, Haruto invites Yuki for dinner, while the students, brimming with excitement, sneak away from their quarters to witness the dazzling fireworks display. Ichico observes Ruka and Yuma embarking on a stroll amidst the revelry, while her classmates revel in the explosive spectacle.
Ryougo engages in a heart-to-heart with Ichico, unaware that Atsushi observes them from a distance, his gaze laden with intrigue. Back in their quarters, the girls forge a bond by sharing their sentiments with Ryouko and Ayami, devising a game: whoever receives a response from their desired boy shall have the liberty to pursue them. Ichico, embracing the challenge, sends a message to Ryougo, her heart fluttering with anticipation.
Concurrently, Mrs. Maki informs Ryougo of the impending dinner with Yuki over the phone, eliciting a wave of dismay from him. He promptly messages Ayami, requesting a meeting, a sudden turn of events that leaves the girls stunned and Ichico's heart in shambles, her embarrassment and heartache palpable as the episode draws to a close.
