Arisugawa Ren tte Honto wa Onna Nanda yo ne 6

One evening, while Kyohei and Ren were at home, the doorbell rings. Kyohei panics upon seeing a beautiful girl, Hina, standing at the entrance with a smile. Ren is shocked to hear about Kyohei and Hina's past relationship. Feeling inferior when comparing herself to Hina, Ren runs out of Kyohei's house...