Ryuutarou Sakagami

One of the students from Japan who got involved in the Summoning Incident, and ended up in Tortus along with his other classmates. He is the childhood friend of [Kouki Amanogawa](https://anilist.co/character/218390/Kouki-Amanogawa), [Shizuku Yaegashi](https://anilist.co/character/141266/Shizuku-Yaegashi) and [Kaori Shirasaki](https://anilist.co/character/132849/Kaori-Shirasaki); and was part of Kouki's party during the training in Great Orcus Labyrinth. He is also the boyfriend of Suzu Taniguchi. (Source: Arifureta Wiki)