Early themes of feeling trapped, or stuck in a rut. Feeling nostalgic and seeking fulfillment in forbidden pleasures. I guess that's as good a starting point for a cheating manga as any.
Cover screams Yuri, but I bet it's hinting at threesomes (or worse) for these bored housewives. This might be a feel-bad story, at least for some characters. If it makes me feel bad enough for the cucked husband, it will cancel out the eroticism.