Oregairu (4).mp4 ⇒

Hayato Hayama, a "popular" student, asks the Service Club to stop a malicious chain-mail slandering his three friends.

A flashback reveals Hachiman was hospitalized at the start of high school after saving a dog—later confirmed to be Yui’s dog . 🧠 Core Themes & Analysis Oregairu (4).mp4

Hachiman realizes the messages are related to an upcoming three-person group project. Since Hayato's group has four people, one member is sabotaging the others to avoid being the "odd one out". Hayato Hayama, a "popular" student, asks the Service

If this refers to the or later seasons : a "popular" student

Believes in finding the culprit so they can face their mistakes and grow.