Wait, isn't this series part of the Yuri Hime publication? Something gay has gotta happen at the end.
Huh? There's Kuro and Miyabi, who got their own little romance arc. Also that bi girl who had her first relationship go badly and is now just flailing around randomly and trying to avoid getting too hooked on anyone.
Then one of the main characters is as gay as it can get, she fell in love and confessed too.
Plenty of "gay" already happened. About half of the characters that have been presented are LGBT characters.
Uta, Risako, Kuro, Miyabi and that casual relationship girl are all of non-straight persuasion and everyone has at least attempted to follow their romantic interests. Even if those attempts have often been half-baked, bit weird or unsuccessful.