Has Nagatsuki completely forgotten that she was irrevocably friend-zoned by Ookuma? What a hopeless basket-case she is. And why is he there, anyway? If you believed what Chiyo told herself, "I’d rather not see him again," you'd think it would have been pretty simple to exclude him. That is, if she really didn't want to see him again.
And the perpetual pervert, Shishijima, is back in his true form. No doubt that he still has lustful thoughts about Chiyo, especially since he's been on board for several months now...