List is taken from the Oricon website.
10. 5,154 Copies Sold – Vol. 4
aka 新説 狼と香辛料 狼と羊皮紙 Ⅳ
aka Wolf and Parchment
Sequel series to Spice & Wolf. Both the prequel and sequel series are licensed by Yen On.
9. 5,212 Copies Sold – Maou Gakuin No Futekigousha Vol. 4
aka 魔王学院の不適合者 4 上 ～史上最強の魔王の始祖、転生して子孫たちの学校へ通う～
https://www.novelupdates.com/series/maou-gakuin-no-futekigousha/
No English license for the light novels
8. 6,329 Copies Sold – Honzuki no Gekokujou ~ Shisho Ni Naru Tame Ni Shudan wo Erande iraremasen ~ Vol. 18
aka 本好きの下剋上 ～司書になるためには手段を選んでいられません～
aka Ascendance of a Bookworm
https://www.novelupdates.com/series/ascendance-of-a-bookworm/
Light Novels and manga are licensed by J-Novel Club. An anime has recently been announced.
7. 6,379 Copies Sold – Saikyou no Kanteishi tte Dare no Koto? Vol. 6
aka 最強の鑑定士って誰のこと?～満腹ごはんで異世界生活～
aka Who is the Strongest Appraiser
No English license for the light novels
6. 8,127 Copies Sold – Kage no Jitsuryokusha ni Naritakute! Vol. 2
aka 陰の実力者になりたくて！
aka To Be a Power in the Shadows!
https://www.novelupdates.com/series/to-be-a-power-in-the-shadows/
No English license for the light novels
5. 8,462 Copies Sold – Kusuriya no Hitorigoto Vol.8
薬屋のひとりごと 8
aka The Pharmacist’s Monologue
https://www.novelupdates.com/series/kusuriya-no-hitorigoto/
No English License for the light novels
4. 8,770 Copies Sold – Shōsetsu eiga doraemon 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
3. 10,927 Copies Sold – Zoku, Kono Subarashii Sekai ni Bakuen wo! Vol. 2
続·この素晴らしい世界に爆焔を! 2 この素晴らしい世界に祝福を!スピンオフ わがままバスターズ
aka Continued, Gifting this Wonderful World with Explosions! Vol. 2
https://www.novelupdates.com/series/zoku-kono-subarashii-sekai-ni-bakuen-wo/
Main series is licensed for English release by Yen On.
2. 14,227 Copies Sold – Vol. 22
aka 新約 とある魔術の禁書目録 22
aka A Certain Magical Index New Testament
https://www.novelupdates.com/series/toaru-majutsu-no-index-new-testament/
No English license for the spin-off series. The main series is licensed by Yen On
1. 21,715 Copies Sold – Vol. 16
aka デスマーチからはじまる異世界狂想曲 16
aka Death March to the Parallel World Rhapsody
https://www.novelupdates.com/series/death-march-kara-hajimaru-isekai-kyusoukyoku-ln/
Light Novel series licensed for English release by Yen On