The descriptions for the top three titles are as follows:
The Dangers In My Heart (via Penguin Random House):
Quirky courtship awaits in this comedy nominated for the 2020 Manga Taisho Award!
Ichikawa Kyotaro, a boy barely clinging to the bottom rung of his school’s social ladder, secretly believes he’s the tortured lead in some psychological thriller. He spends his days dreaming up ways to disrupt his classmates’ peaceful lives and pining after Anna Yamada, the class idol. But Kyotaro’s not nearly the troubled teen he pretends to be…and it turns out Anna’s a bit odd herself!
Solo Levelling (via tappytoon):
In a world where awakened beings called “Hunters” must battle deadly monsters to protect humanity, Sung Jinwoo, nicknamed “the weakest hunter of all mankind,” finds himself in a constant struggle for survival. One day, after a brutal encounter in an overpowered dungeon wipes out his party and threatens to end his life, a mysterious System chooses him as its sole player: Jinwoo has been granted the rare opportunity to level up his abilities, possibly beyond any known limits. Follow Jinwoo’s journey as he takes on ever-stronger enemies, both human and monster, to discover the secrets deep within the dungeons and the ultimate extent of his powers.
Senpai wa Otokonoko (via Webcomics.jp):
The story of a cross-dresser who is confessed to by their junior.
According to the AnimeJapan 2021 website, the polls for this year’s rankings received around 250,000 votes, which is 1.3 times higher than last year’s amount.
Source: AnimeJapan 2021 Twitter