Ryūnen! Todome-senpai
留年! とどめ先輩 · りゅうねん! とどめ せんぱい
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Sato is a high school boy struggling with his grades, but that's the least of his worries. His childhood friend and former upperclassman Waseda Todome wants to spend time with him (the keyword being "former", as she's repeating the first year and now shares classrooms with Sato). The problem lies with the fact that, while being cute and flirty, she's dumb as bricks, and intends to make him sabotage his own grades because she doesn't want to be alone at the bottom of the school's grade ranks. However, it turns out that she's dumb as bricks when it comes to that too... Todome's poor planning has some unintended consequences, as it readily reveals that her intentions with Sato do not lie purely within the academic side of things... Will Sato take the hint, notwithstanding Todome's bad clues? Note: Includes 4 extra chapters.
Source: AniList
Synopsis 日本語
ポンコツなため留年したとどめと高校に入学したばかりの里は、幼なじみ兼クラスメイトとして高校生活を始めた。とどめは行く先々で里の勉強の邪魔をしようとするが、その大半が失敗してしまう。そうした中で、とどめの元同級生の一橋や青山などと里は交流してしまい、さらに巻き込まれていく。
Source: Wikipedia「留年!とどめ先輩」 (CC BY-SA 4.0)
External databases: MADB · Wikidata · AniList
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