Thanks for the chapter! If the mangaka follows the typical route, Matsumoto will start out as a wingman who befriends the FMC and ends up spending more quality time with her than the MC and eventually develops romantic feelings for her and ends up becoming a rival.
As adorable as I think Yakushimaru-chan is, I just wish she'd stop being such a prig to Ootaki who she obviously has romantic feelings for. Of course, it wouldn't be surprising if she also starting having romantic feelings for Matsumoto if he treats her as if she's special.