Watari-kun's ****** Is about to Collapse, Volume 16

Naoto and Satsuki will be living together during summer break. Despite some hiccups and misunderstandings, the two are steadily growing closer. They later attend the wedding of Naozumi and Yayoi. This is where Naoto learns that Satsuki is feeling unsure about marrying him. Just what will ultimately become of their relationship?