Here’s what I think is going to happen. Ryou is going to know where that trinket is from because of Ichika. That woman will somehow fall for him because “He knows my hobby~” and then rival bullshittery.
@banich1 I doubt Matsushima is going to fall for Ryou but I think they're going to discover each other secret and get closer as friends and somehow this will create a misunderstanding with Ichika.