I read this since I understand the language so I'll give you guys the main things in this chapter.
1) Jirou met his old elementary friend after the party and they talked about how Jirou and his elementary friends haven't change since that guy moved school. The guy also asked Jirou for Hamano's NUMBER (the short hair, tomboyish girl) too LOL. Shiori only eavesdropped and probably knew that guy as well.
2) Tenjin's brother is going to marry his fiance, who was Tenjin's LOVE INTEREST iirc and the guy he works with at the convenience store knew about it when she came to buy things there AND to find out that Tenjin will have a day off because of the wedding in Dec 6th./ISPOILER]