Wakaba

One of the students in the classroom that was caught in the explosion from the fight between the Demon Lord and Hero at the beginning of the story.

Description
According to references from her classmates, Wakaba Hiiro was the "queen" of their school in terms of beauty. Due to this, she ends up a bit isolated and many people found it difficult to talk to her. She was loner both inside of class and outside of school, always keeping to herself. Making her an easy target for bullying by one of the most popular girls in class, Shinohara Mirei, now known as Feirune in the other world. After spending some time reflecting after her reincarnation, Feirune expressed remorse for her past action and wanted to make an apology to her. Later in the series, she was informed by her reincarnated homeroom teacher she was dead, which greatly saddened Feirune and shocking reminder the reality of the new world they reincarnated in. Ooshima Kanata, presently known as Katia, once made a half-hearted confession to her. It was implied he was already uninterested in the opposite sex back then, he wanted to use the botched attempt to fit in better with the rest of the boys in class, intentionally choose Wakaba knowing he will get rejected based on her personality and history.

History
As the series progress, due to increasing prompt to reveal the numerous secrets that Filimøs was hiding from Shun's faction and unexplained disappearances from the academy, Filimøs revealed some of the status of the other Japanese classmates, including the current whereabouts of Wakaba Hirro from the request of Feirune, due to her guilt from her past life.

According to Filimøs, Wakaba Hiiro, didn't survived the ordeal in the new world.

Throughout the series, there was small hints that implied that Wakaba Hiiro was the identity of Kumoko. This was later confirmed in the Elf Village Arc, when a seemingly alive and unscathed Wakaba made an appearance. This greatly shocked Filimøs, Shun and his fellow reincarnations.

It is later revealed that Kumoko was not actually the real Wakaba Hiiro. But took on her appearance and form due to D's influence in the beginning of the story. "Wakaba Hiiro" was a false identity created by D, which she used masquerade as a high school student, partly to escape and slack off from her responsibilities as a god and enjoy Earth life.

One day, during a literature lesson, the class was struck by a mysterious explosion that killed everyone accept Wakaba Hiiro. In reality, the explosion was the result of combined a magical attack from a previous Hero and Demon Lord to assassinate Wakaba, viewing her as the cause for their world's plight. Feeling responsible for her classmates and teacher dying in the crossfire, and thinking it would be fun, she collected their souls and reincarnated them.

However, all her classmates dying and being reincarnated would likely draw the attention of fellow gods, and Wakaba Hiiro not being amongst them would surely lead to D being discovered. Therefore, she decided to misdirect them by giving the piece of her soul that was Wakaba Hiiro, with all her memories of her time on Earth, to a spider that happened to be in the classroom at the time, resulting in the creation of Kumoko. In addition, to make sure the other reincarnates wouldn't notice her absense, she also messed with Filimøs' Student Roster skill, which records the status of her students, by having it state that "Wakaba Hiiro" was dead.

After creating Kumoko by fusing the part of her soul that was Wakaba Hiiro with a spider, D reincarnated her in the Great Elroe Labyrinth and expected her to quickly die off, taking the evidence of D's time on earth with her. However, she instead continued to survive and take on an appearance that is a combination of Wakaba Hiiro and her spider form following her after evolving into an Arachne and Shiraori.

Shiraori was greatly displeased after learning her current existence was build on a lie.