Episode 3.5 features two short segments titled "Matsu-jiru" and "Douteina Hero."

Matsu-jiru - One day, the Matsuno boys are greeted by a morning different from usual... A special day for them begins.

Douteina Hero - One day, Choromatsu discovers a group of college students enjoying a barbecue. But he feels inferior next to these college students who live in a different world. What's revealed is...

(Source: Anime News Network)