My Stepmother and Stepsisters Aren't Wicked

My cousin Yaeko came to visit the Kouzo family.
She brought a cake as a gift to celebrate Miharu's passing her academic exam. As she took Arisa's hand and headed towards the terrace for tea, she carelessly bumped into Teru.
Yaeko turned pale at her blunder towards Teru, who was someone her parents feared and the legitimate wife of the main family. She immediately apologized, but Teru's appearance made her even more embarrassed.
Desperate to make amends, she impulsively invited Teru to have tea with her—?

It's parent-teacher observation day at Eihou Girls' Academy. The teachers line up to welcome the parents. There's a rumor that if a parent takes a liking to you, you'll be unemployed the next day, so the teachers look nervous. Amidst all this, Teru speaks to each teacher individually and praises them. Hanayama and Mikuriya's mother are captivated by her.
Teru observes Marika and Arisa's class and then goes to Miharu's classroom. Miharu is the only one in the academy with a background like hers, so everyone's eyes are on her. Amidst curious eyes and gossip, Miharu reads her essay under Teru's watchful eye—

Student council president Mikuriya Sada valued discipline and, due to her strict personality, enjoyed immense support from the students. Though she suspected she might be mistaken, Miharu couldn't help but see the student council president's image in the woman with the dog she'd met in the park.
Meanwhile, in the student council room, a meeting was being held. The topic was the survey conducted on parent-teacher day. It concerned the negative impact and loss of social credibility caused by the enrollment of an illegitimate child, but for some reason, no such concerns had been raised by the parents of Kouzo Miharu's class…