Moto Sekai Ichi'i no Sub-chara Ikusei Nikki - Chapter 45: A Dog’s Misfortune

From a media tycoon’s daughter to a poor plumber’s girl, but it seems that Yu Yao is unfazed? She opened the eyes of the sky, and her life has been opened all the way. She is an eighteen-year-old girl, but as soon as she turns around, she becomes a big boss who no one in the entertainment industry dares to offend.

- Description from Novelupdates

He became the Emperor when he was just a boy and was beheaded before reaching adulthood. It was a tragedy brought about by his fate as the first noble wizard.“Ian, don’t be born in your next life.”He thought everything was over, listening to the traitor’s heartless words. He knew, but…“You are a symbol of peace. Where else would you find such honor as a lowly one?”He became the Margrave’s bastard son, whose family went extinct 100 years ago.A lowly, unsophisticated one, destined to be sold as a hostage to the barbarians across the border.

[The End of Spoiling] On her first day at the new school, childhood heartthrob Zac unexpectedly kissed her in front of the whole school! He even declared that she was his girlfriend!He pampered her, protected her, fought off the riff-raff, and shooed away other suitors, but he stubbornly refused to admit that he liked her.Until one day—[Spoiling√][Childhood friends√][No reposting or rewriting√]

The protagonist, having degenerated into a “loser” after being unable to find employment, gets caught up in someone else’s attempt to commit suicide-by-train and ends up traveling to another world. The numerous cheat powers he demands from God are all granted to him. But contrary to expectations, these powers bring about disastrous consequences for the protagonist.

Having reincarnated into another world, the optimistic protagonist (Yuuri) starts his(her) heart-warming training days with his(her) teacher.