: A central theme is the idea that certain actions cannot be undone, leading to a permanent change in the "lifestyle" and social structure of the friend group. Media Information

: Originally a manga, it was adapted into an ONA (Original Net Animation) by Studio Hokiboshi in Spring 2023.

This manga is strictly for adults (18+). It contains explicit sexual content and heavy psychological themes.

For those looking for the full experience, the manga provides significantly more detail regarding the internal monologues and gradual shift in the couples' dynamics. Official mature manga platforms like Coolmic often host similar "Marriage Exchange" or "NTR" themed titles for digital reading.