Kouhai-chan

Kouhai-chan (後輩ちゃん) is a character from "Arifureta Shokugyō de Sekai Saikyō After Story".

She is an (as of yet) unnamed student of the school the students that were summoned to Tortus and member of the Soul Sisters, as she enrolled into the high school to investigate Shizuku Yaegashi's and Hajime Nagumo's relationship with each other.

Appearance
Kouhai-chan is a girl in her early teens (approximately 13 years old) wearing her hair in twin tails. She wears the usual uniform of her school.

Personality
Kouhai-chan is tough and bold young girl easily considered top brass that's hard to come by, no matter how many times she is repelled, she will resurrect like an immortal bird and will face the great enemy with unyielding fighting spirit. Sadly such traits of hers comes off as pure insolence and foolhardyness. This is mostly in due to her idolization of an upperclassman at her school, Shizuku Yaegashi, so much in fact, that it borders on toxic obsession for her.

Biography
It's currently unknown how, when, and why Kouhai-chan came into the Soul Sisters, but it can be speculated that she is one of it's original members, along with Mitsuki Amanogawa, and Manami Endou. When Shizuku and the rest of her class were summoned to the alternate world, Tortus, Kouhai-chan and the rest were waiting dearly for her return. Fortunately, Shizuku did come back, along with the remaining students of her class. Unfortunately (for Kouhai-chan and her fellow Soul Sisters), Shizuku was in love with Hajime Nagumo, and not Mitsuki's older brother Kouki. This lead her to enrolling into their school to investigate the relationship between the two.

About a year after Shizuku and the other students returned to Japan, when the Returnees were about go on a field trip to Kyoto, Kouhai-chan was their at the gathering spot earlier than everybody else to tell Shizuku to safe and use Hajime as an escape decoy if plans go awry, burring and rubbing her face into Shizuku's chest. However, Shizuku was really embarrassed by her acting out like it was the last time they would meet, this lead to Hajime intervening by grabbing the crazed fan girl in the back of her head and grinding his fingers on it so hard, he could crush it with his bare hand, all the while he simply yawned and Kouhai-chan was writhing in agony. Hajime then tied her to a nearby electric pole via wire, covered her mouth with a mouth gag, and hung a sign that read, "In the middle of morning training. Please don’t talk to me." around her neck. However that didn't stop her from attempting to slip out her bindings, as soon as Hajime saw this, he took out a bola binding her down again. In a last ditch attempt as the bus to Kyoto was taking off, Kouhai-chan slipped out from her bindings and started to pursue the bus, chasing after it like she was in a 500m olympic sprint, screaming "OONEEESAMAA!" at the top of her lungs (but it fell on deaf ears of the classmates), she then fell hard onto the asphalt, face first as her figure vanished far behind.

When Shizuku Yaegashi and Hajime Nagumo were on their way to do a wedding-themed photoshoot as a favor for Kouki Amanogawa's mother, they were suddenly approached by Kouhai-chan and the other Soul Sisters just as they arrived at the venue. They attempted to attack Hajime in order to make him unable to do the shoot. Hajime easily repelled the Soul Sisters after he grabbed her and forced her to drink a laxative before tying her pigtails up and writing on her face with a permanent marker as an example of what would happen if they tried to challenge him. As the Souls Sisters were prepared to leave, Manami and Mitsuki suspected that she actually liked being bullied by Hajime, much to her denial.

Close Associates

 * Mitsuki Amanogawa & Manami Endou - Her fellow Soul Sisters.
 * Shizuku Yaegashi - As a member of the Soul Sisters, Kouhai-chan idolizes Shizuku. Unfortunately, Shizuku finds her and the rest of the Soul Sisters annoying for their attempts to break her up with Hajime.

Enemies

 * Hajime Nagumo - Like the rest of the Souls Sisters, Kouhai-chan hates Hajime and wants to end his relationship with Shizuku Yaegashi, which has always ended in failure. Despite her repeated attempt to get in his way, Hajime admits he doesn't hate her and enjoys turning the tables on her and the other Soul Sisters. This is mostly because she reminds him of Shea when they first met; hopeless yet never giving up.

Trivia

 * Kouhai-chan serves as the Soul Sisters' Assault Captain and Intelligence Officer.
 * Many of the Returnnees have half-seriously called Kouhai-chan a hero because she keeps challenging Hajime, the Demon King.