I wanted to ask if the games have incest?

Sumire Kiryuuin

She is the daughter of the Vice-Chairman of the Kiryuin Group, a major group company. This resulted in her grand popularity in the school, making her one of the 'elites'. After her cousin, Yusho, decided to step back from being the heir of the next chairman, Sumire decided to replace him in that role. She had a chance to become president of the Disciplinary Committee, however, she declined the opportunity due to Yusho being the mastermind behind the school festival incident. That position would be granted to Chisaki. Back in middle school, she was once a candidate in the election campaign with Yusho as her partner. However, she conceded in the run after a defeat against Taniyama in a school debate.

Elena Narahashi

She is an extremely outgoing, playful and friendly person, and her nature has been described to even surpass Yuki's mischievous little sister mode, often making lewd and suggestive jokes. She shows herself as a rather eccentric character, but she does have a more mature and earnest personality, and as Masachika says, she's actually quite shy, sensitive and a fundamentally sensible person, but that side is mostly kept hidden away.

I read the novella, it was good if you should add these girls?