Ep. 3: Kouta supports Yuu during a heated sibling conflict with his sister Yuri.
Aired on January 20, 2018

Kouta feels relieved after admitting his love for Pompompurin and has bonded with Yuu and Shunsuke. Yuu appears carefree but is actually a responsible older brother caring for his younger sister, Yuri, while their parents work. Despite his efforts, Yuri is in a rebellious phase and rejects his help. When Kouta and Shunsuke visit Yuu while he is sick, they witness a fierce argument between the siblings. Hurt by Yuri’s harsh words, Yuu leaves the apartment in anger. Kouta and Shunsuke chase after him to ensure he is safe and well.
Episodes
- Ep. 1 · Average high schooler Kouta finds purpose through childhood plushies and a popular classmate's lost item.
- Ep. 2 · Kouta searches for his lost Pompompurin while befriending Sanrio-loving classmates
- Ep. 3 · Kouta supports Yuu during a heated sibling conflict with his sister Yuri.
- Ep. 4 · Shunsuke faces team removal after struggling with isolation and past trauma.
- Ep. 5 · Deepening Bonds and Student Council Mediation
- Ep. 6 · Seiichirou collapses after Ryo discovers his Puroland pass and confronts him.
- Ep. 7 · The Sanrio Boys Enjoy a Joyful Holiday at Puroland