List is compiled from Oricon rankings for Light Novels and Literature.
10. 3,413 Copies Sold – Gokufuri kyohi shite tesaguri sutāto! Toku-ka shinai hīrā, nakama to wakarete tabi ni deru Vol.1
aka 極振り拒否して手探りスタート! 特化しないヒーラー、仲間と別れて旅に出る 1
aka I Refuse to Min-Max and Start Fumbling About! I Will Head Out As a Healer that Does Not Specialize [Their Stats] Separately from My Friends
9. 3,464 Copies Sold – Sekai saikō no asashin, isekai kizoku ni tensei suru Vol. 1
aka 世界最高の暗殺者、異世界貴族に転生する
aka The World’s Best Assassin: To Reincarnate in a Different World Arristocrat
https://www.novelupdates.com/series/the-best-assassin-incarnated-into-a-different-worlds-aristocrat/
No English License for the light novels
Same author as The Redo of a Healing Magician
8. 3,822 Copies Sold – Shōsetsu eigadoraemon Nobita no getsumen tansa-ki
aka 小説 映画ドラえもん のび太の月面探査記
aka Doraemon the Movie 2019: Nobita’s Chronicle of the Moon Exploration
7. 3,920 Copies Sold – Yakusoku no Neverland: Mama-tachi no Tsuisoukyoku
約束のネバーランド ~ママたちの追想曲~
aka The Promised Neverland – Mama’s Reflection Song
No license for the light novels. This is the 2nd light novel volume based on the manga
The manga is licensed for English release by Viz.
An anime adaptation is currently airing.
6. 4,277 Copies Sold – Hataraku maō-sama no meshi!
はたらく魔王さまのメシ!
aka The Devil is a Part Timer Meshi
The main series is license for English release by Yen On
5. 4,799 Copies Sold – Sekai Saikyou No Kouei Meikyuukoku No Shinjin Tansakusha Vol. 4
世界最強の後衛~迷宮国の新人探索者 4
aka World Strongest Rearguard – Labyrinth Country and Dungeon Seekers
https://www.novelupdates.com/series/world-strongest-rearguard-labyrinth-country-and-dungeon-seekers/
No English license for the light novels
4. 9,586 Copies Sold – Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e Vol. 10
aka ようこそ実力至上主義の教室へ 10
aka Classroom of the Elite
https://www.novelupdates.com/series/youkoso-jitsuryoku-shijou-shugi-no-kyoushitsu-e/
Licensed for English release by Seven Seas. Volume 1 is available digitally & comes out in print May 7.
3. 10,410 Copies Sold – Kimetsu no Yaiba
aka 鬼滅の刃 しあわせの花
aka Demon Slayer Happy Blosom
Light Novel based on Manga series
2. 19,195 Copies Sold – Mahouka Koukou no Rettousei: Shiba Tatsuya Ansatsu Keikaku Vol.2
aka 魔法科高校の劣等生 司波達也暗殺計画 2
aka The Irregular at Magic High School Plan to Assassinate Tatsuya Shiba
https://www.novelupdates.com/series/mahouka-koukou-no-rettousei/
Parent Series is licensed for English release by Yen On. They will release volume 11 March 2019.
The manga is licensed for English release by Yen Press
1. 28,249 Copies Sold – Mazemonogatari (Mix Story)
aka 混物語