マウントという単語がこの世に浸透しウン１０年…。日々巧妙に進化しているマウント。誰もがイラっとしてしまう言葉を、白川さん（井桁弘恵）は感謝ではねのけてしまう。そんな、誰にでもいい子ちゃんの白川さんだが、高校時代に姫子（黒木ひかり）にいじめられていた過去がある。さらに同期の谷口さくら（藤野涼子）からは露骨に無視をされ続けており…。それでもなぜ、白川さんはポジティブな白川マインドを持ち続けるのか…？
It's been 10 years since the word "mount" permeated the world. Mounts that are cleverly evolving day by day. Mr./Ms. Shirakawa (Hiroe Igiri) dismisses the words that irritate everyone with gratitude. Mr./Ms. Shirakawa is such a good girl for everyone, but she has a past where she was bullied by Himeko (Hikari Kuroki) in high school. In addition, she continues to be blatantly ignored by her classmate Sakura Taniguchi (Ryoko Fujino). Still, why does Mr./Ms. Shirakawa continue to have a positive Shirakawa mindset...?
