How Do We Relationship? manga volume 3 features story and art by Tamifull.

Miwa and Saeko are loving the couple life, but a miscommunication in the bedroom proves to be more of a threat to the easy rhythm of their relationship than either thought possible. After all, the past is hard to leave behind, especially when Miwa is invited to a reunion with some of her high school friends, including the first love she never really got over.