Kind classmate's sex education Haruki Sato Tsubomi Tsuna Kimura

I thought everyone was good friends. But the threads get tangled over small things. Her friend Haruki bullies her childhood friend Tsuna. I thought he was teasing me somehow. However, when they learn the truth about Haruki, the three high school girls struggle to help each other and somehow break out of this situation... This is Tsuna Kimura's first collaboration. Also includes lesbians of Tsubomi and Haruki!