Episode One

The first episode of Senpai Club.

Part One
The episodes starts with Tsumiki Domen shown asleep in her room, as she introduces herself in a voiceover. She then wakes up and realizes she's late for her first day of high school, and rushes outside after quickly getting ready. While running to school, she bumps into a boy and proceeds to scold him for his reckless behavior before realizing yet again that she will arrive at school even later. As she runs away, the boy confides that he finds her cute.

Tsumiki arrives at school, and her teacher scolds her for being late. Tsumiki feels ashamed for having embarrassed herself in front of a cute boy and her entire class. She decides she will find the boy she bumped into and apologize to him. While walking through her school's hallways, she peers into a classroom and sees the boy. She enters the room and is greeted by a group of Senpais, welcoming her to the "Senpai Club."

Part Two
One by one, the Senpais introduce themselves to Tsumiki, including Hero Senpai, who is the same boy she bumped into on her way to school. When Tsumiki nervously tries to introduce herself to them, they realize she isn't a Senpai, and forcefully escort her out. Lady Senpai, the sole female member of the club, feels bad for how the Senpais treated Tsumiki and follows her outside.

Senpai-kun explains why he started the club, and a flashback ensues - Senpai-kun had offered cookies and manga to a love interest of his, only to have these gifts rejected by her. Offended by this, Senpai-kun vowed to ignore girls from that point forward, and founded the Senpai Club with this goal in mind. As Computer Senpai begins a lesson on how to ignore girls, Hero Senpai can't stop himself from thinking about Tsumiki.

Part Three
Following the events of part two, Lady Senpai kindly bids Tsumiki farewell, while Tsumiki seems uncomfortable. Tsumiki returns to her classroom to eat lunch, and notices that another student is crying. Tsumiki approaches the student and asks her what's wrong, and the student exclaims that she finds Teacher Sensei attractive. Tsumiki offers to help her confess her feelings to Teacher Senpai, and the student introduces herself to Tsumiki as Fumiko Kurokawa.

After class, Tsumiki and Kurokawa approach Teacher Sensei. Kurokawa becomes too captivated by Teacher Sensei's appearance to say anything, but grabs her breasts. Teacher Sensei angrily kicks them out, and Kurokawa begins crying again. Tsumiki comforts her, saying they'll try again tomorrow, and they walk home together as Hero Senpai watches them from inside the school, planning to talk to Tsumiki.