Responses
It starts off with a small misunderstanding with the 3 involved but in fact it's the story of 2 couples (the 4th guy is just not on the cover ;) )
The story up 'till the second to last chapter was about 2 couples. In the last chapter Tomoharu and Aki are shown-it's the police story~ http://www.mangago.zone/read-manga/honto_yajuu/ There you go :)
Is there ONE couple or is it a complicated thing which three are involved in?