Rent-a-Girlfriend Season 3 Episode 4: D-Day and Girlfriend

Kazuya Kinoshita and Chizuru Mizuhara walk through a quiet neighborhood. The lie they live hangs heavy between them. Chizuru admits she cannot tell her grandmother the truth, feeling the ambiguity was a kinder deceit. Kazuya senses her vulnerability. He makes a solemn vow to shield her from any harm the situation might bring.

The water park air grows heavy. Nagomi Kinoshita stares at Mami Nanami's phone, seeing the 'Rent-a-Girlfriend' profile. Her hands tremble. Her eyes reflect deep sadness. All her hopes for Chizuru shatter before her. Kazuya watches his grandmother's spirit break. He feels a crushing wave of failure. Chizuru stands silently beside him, unable to speak.

In a sudden, desperate move, Kazuya Kinoshita drops to his knees. He loudly declares that Chizuru Mizuhara is his real girlfriend. He invents a new timeline, claiming their true relationship began just a week before his grandmother's passing. This lie sends shockwaves through Kuribayashi and Kibe. Ruka Sarashina looks completely shattered. Chizuru is caught off guard by the sheer scale of his fabrication.

Unable to tolerate the deception, Kibe grabs Kazuya Kinoshita by his swimwear. He pulls Kazuya up, demanding to know if this is another lie to save face. Tears stream down Kazuya's face. He shouts his 'truth' with a mix of fear and conviction. This raw confrontation shows the strain on their friendship, a friendship Kazuya is now risking.

Kazuya Kinoshita's thoughts race. He recalls Chizuru Mizuhara's kindness and resolves to become the man she needs. Mami Nanami observes the drama. Her eyes are cold, calculating. She senses a weakness in their story. She challenges them to prove their love with a kiss. The demand creates new panic in Kazuya. Chizuru remains frozen, stoic, under the spotlight.

A flashback reveals Ruka Sarashina's childhood. A heart condition forced her into a restricted, passionless life. Her world felt monochrome. She sought a 'special heartbeat,' a true thrill. Her search was fruitless until she met Kazuya Kinoshita. His clumsy sincerity finally made her heart pound. Later, on a date, she reveals her fear. She is merely a temporary replacement for Chizuru Mizuhara. She pleads for a real chance.

Back at the pool, Ruka Sarashina spirals. She watches Kazuya Kinoshita cry. His tears are for someone else. This realization cuts deeper than any physical ailment. Mami Nanami watches, a sadistic smirk on her face. Nagomi Kinoshita anchors the scene with her silent disappointment. A lifeguard approaches, but Nagomi keeps him away. Ruka tries to reveal the 'trial' truth, but her words are lost. Mami waits for the kiss, or for their defeat. Onlookers begin to notice.

Another flashback takes us to Kibe supporting Kazuya Kinoshita after his first breakup with Mami Nanami. Kibe takes him to an arcade, then to a restaurant. He gives Kazuya a stern lecture. Honesty is crucial with loved ones. Lying to family leads to ruin. These words echo in Kazuya's mind in the present. He sees Kibe's disappointed face. He realizes he is doing exactly what he was warned against. He feels trapped, bound by his need to protect Chizuru Mizuhara.

Kazuya Kinoshita descends into a deep mental breakdown. He silently apologizes to everyone he has deceived. He feels he has failed as a grandson. He has failed as a friend. He led them into a web of lies. It has finally collapsed. He looks at Nagomi Kinoshita. Her visible aging and distress seem his direct fault. He is overcome with worthlessness. The world around him begins to fade into a white void. He braces for the final blow.

A tense silence hangs in the air. Chizuru Mizuhara walks directly to Kazuya Kinoshita. She takes his face in her hands. She kisses him passionately, right there, in front of everyone. Mami Nanami, Ruka Sarashina, Nagomi Kinoshita, Kibe, and Kuribayashi are all stunned. The kiss is prolonged and intense. It is a desperate, public confirmation of their 'genuine' relationship. Chizuru's bold move silences Mami's challenge. It also binds them deeper to their shared lie. The episode ends, leaving all their futures uncertain.