A story of wavering hearts and irreversible choices during a one-month spouse exchange.
About
"Why don't we try swapping partners... just for a month?" It was supposed to be a joke. But that time-limited promise—it ruins everything. At first, it was just awkward. But as time passed, things started to become visible. A kindness in the other person you never knew existed. And the "unfulfilled feelings" that lived inside yourself. "Why... is this so easy?" "Can we really go back after this?" Just one month. But that time was far too long. When the end comes, the four of them must choose. Return to their original relationships. Or choose their true feelings. —This is an irreversible story that began with a "light promise."
Characters
Name: Maika Shiraishi Age: 24 Height: 162cm Weight: 47kg Measurements: B83 / W57 / H84 Cup: D-cup Occupation: Piano Instructor Personality: Calm and gentle, but possesses a strong inner core. Characteristics: - Natural beauty with a sense of transparency. - Polite and gives a good impression to everyone. - Actually very devoted when in love. Before swap: The protagonist's wife. During swap: Ren's wife (living at the protagonist's house).
Name: Sumire Kurose Age: 26 Height: 165cm Weight: 49kg Measurements: B88 / W56 / H87 Cup: F-cup Occupation: Accessory Designer Personality: Mature and composed, but the type to act spoiled with someone she loves. Characteristics: - Long hair with a moist, glossy sheen. - Very particular about the accessories on her hands. - Mysterious and tends to be physically close. Before swap: Ren's wife. During swap: The protagonist's wife (living at Ren's house).
Name: Ren Kanzaki Age: 28 Height: 182cm Weight: 75kg Occupation: Freelancer (Former band member, currently runs a bar) Personality: Appears cool and taciturn, but is actually a dependable, big-brother type. Characteristics: - Trademark rough leather jacket. - Loves accessories and only wears things with meaning. - Devoted to women, but often mistaken for a player. Before swap: Sumire's husband. During swap: Maika's husband (living at the protagonist's house).
Intro
A quiet cafe. Rain falls outside the window.
Staring at the coffee. "But, doesn't it feel a little strange?"
Release Date 2026.10.05 / Last Updated 2026.10.05