Amanogawa Ke no Yon Shimai - Ch. 104 - Jealousy

[MangaDex]

 

[Kaarme]

Are all those sisters perhaps too sensitive to what they perceive as cheating? I bet the oldest sister's man merely had a business lunch with a woman, or something equivalent. At least I don't think this is the kind of series where he would really cheat on her.