Masamune-kun's Revenge

As an overweight child, Makabe Masamune was mercilessly teased and bullied by one particular girl, Adagaki Aki. Determined to one day exact his revenge upon her, Makabe begins a rigorous regimen of self-improvement and personal transformation. Years later, Masamune re-emerges as a new man. Handsome, popular, with perfect grades and good at sports, Masamune-kun transfers to Aki's school, and is unrecognizable to her. Now, Masamune-kun is ready to confront the girl who bullied him so many years ago and humiliate her at last. But will revenge be as sweet as he thought? (Source: Seven Seas Entertainment)

ReLIFE

The story follows Kaizaki Arata, a 27-year-old jobless man, who fails at every job interview he had after quitting his last company. His life changes after he met Yoake Ryou of the ReLife Research Institute, who offered him a drug that can change his appearance to 17-years-old and to become a subject in an experiment for one year. Thus, he begins his life as a high school student once more.

Tokyo Revengers

Takemichi Hanagaki is a freelancer that's reached the absolute pits of despair in his life. He finds out that the only girlfriend he ever had in his life that he dated in middle school, Hinata Tachibana, had been killed by the ruthless Tokyo Manji Gang. The day after hearing about her death, he's standing on the station platform and ends up being pushed over onto the tracks by a herd of people. He closes his eyes thinking he's about to die, but when he opens his eyes back up, he somehow had gone back in time 12 years. Now that he's back living the best days of his life, Takemichi decides to get revenge on his life by saving his girlfriend and changing himself that he'd been running away from. (Source: Crunchyroll)

Bagel Girl

Bong Gi used to have dreams of making something of his life. But now all that seems like a distant memory. He has become fat, lazy, unemployed, and altogether unlovable. In the real world, people are grossed out by him. He has never had a girlfriend and he spends his late nights fantasizing about women whose pictures he leers at on the internet. His own life appalls him, but he has one escape – his online life. Gaming has become his everything, and he excels at it. After another long, lonely night of gaming, he wakes up – and is shocked to find that he has transformed into a woman. Or to be more precise, a woman who looks a lot like those he used to lust after online! Confused, he does not know where to turn – so looks for answers on the net. He encounters a young woman in a chat forum named Sae Mi, who offers him advice. He soon falls for her charms – which makes things complicated, to say the least. And things get even more bizarre when he attempts to take revenge on Sang Woo, a school bully who turns out to be Sae Mi’s older brother! “Bagel Girl” is a 2019 animated South Korean series based on a web-hosted cartoon strip by Tank Guy.