From Thug to Idol: Transmigrating to a Survival Show - Chapter 570 The Enemy’s Vow

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

- Description from Novelupdates

Astri White has always felt like an outsider, never truly belonging to any group or place in the world. Raised in an orphanage, she yearns for a sense of belonging and the feeling of genuine love. However, her life takes an unexpected turn when she finds herself mysteriously transported to another world, the enigmatic and magical realm known as the Beastmen World.In this strange and fantastical land, Astri encounters a diverse array of beings known as beastmen—creatures possessing both human and animal traits. As she navigates this unfamiliar world, she discovers that she possesses extraordinary powers, unlike anything seen before. Her unique abilities set her apart from both humans and beastmen, marking her as an exceptional and crucial figure in the realm.As Astri interacts with the various beastmen she meets, she begins to learn about the different facets of love. Through their diverse experiences and perspectives, she gains insights into the depths of love and the connections that bind individuals together. As her relationships with the beastmen grow, Astri discovers the true meaning of family and friendship, experiencing the warmth and support she had always craved.However, not everything is idyllic in the Beastmen World. There are dark forces at play, threatening the delicate balance of the realm and putting Astri and her newfound family in jeopardy. With her remarkable powers, she becomes a target for those seeking to exploit her abilities for their own nefarious purposes.As the danger escalates, Astri must embrace her role and harness her powers to protect the world and the ones she loves. In the process, she uncovers secrets about her own origin and the significance of her presence in the Beastmen World.“Beastmen Love” is a captivating tale of self-discovery, acceptance, and the transformative power of love. Astri White's journey from feeling like an outsider to finding her place in a fantastical world filled with extraordinary beings will resonate with readers as they follow her on a thrilling adventure of magic, romance, and personal growth.

The story is about a boy entering high school, who answers a strange call from a public phone one night. The caller challenges him to a bet: She’ll remove the birthmark which he sees as the cause of so many problems, and he’ll have fifty days to win the heart of a girl he’d considered far beyond his reach. And with this, a very strange summer begins.