改善 – Used in

Verb (する, transitive)

1. betterment; improvement

Usually written in kana

2. kaizen (Japanese business philosophy of continuous improvement)

oft. written カイゼン

	Used in	Used in %
Anime	123	(8%)
Live action	210	(16%)
Visual novels	281	(52%)
Novels	863	(44%)
Non-fiction	64	(44%)
Web novels	496	(47%)
Aozora Bunko	87	(15%)

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Meanings

Used in

Kishimu Eden no Grimm Reaper

Tobira no Soto

Ouhi no Pride

Onnanoko wa Yasashikute Kawaii Mono Da to Kangaeteita Jiki ga Ore ni mo Arimashita

Majutsu Yaburi no Revenge Magia

Idainaru Daigensui no Tenshin

Dokuzetsu Shoujo no Tame ni Kitakubu Yamemashita

Hageshii Joshishi ga Koukousei ni Modottara Ore ni Deredere Suru Riyuu ~ Ryou Kataomoi no Yarinaoshi Koukousei Seikaitsu

Koi Shiteru Hima ga Aru Nara Gacha Mawase!

Koigataki wa Ojousama ☆

Shichi-nin Misaki mo Koi wo Suru

Nanji, Hoshi no Gotoku

Danzai sareta Akuyaku Reijou wa, Gyakkou shite Kanpeki na Akujo wo Mezasu

Ryuuou no Oshigoto!

Ring Series

Densetsu Series

Hagoku

Brave Witches Prequel

Boushoku no Berserk: Ore dake Level to Iu Gainen wo Toppa suru

Yamizokusei no Mahoutsukai da ga, Naze ka Yuusha ni Natteshimatta: Sore wa Tomokaku Yome ni Ii Kurashi wo Saseru Tame ni Ganbatte Nariagarou to Omou

Hazurewaku no "Joutai Ijou Skill" de Saikyou ni Natta Ore ga Subete wo Juurin suru made

Mushoku no Eiyuu: Betsu ni Skill Nanka Iranakatta n da ga

Utsuro naru Regalia

Potion, Wagami wo Tasukeru

Kakuriyo no Yadomeshi

Kanojo ga Flag wo Oraretara

Kenshi wo Mezashite Nyuugaku shita noni Mahou Tekisei 9999 nan desu kedo!?

Maburaho

Hazure Skill "Mapping" wo Te ni Shita Shounen wa Saikyou Party to Dungeon ni Idomu

Missing: Kamikakushi no Monogatari

Totsuzen Kishi ni Natte Mufufu na Ore ga Iru

Zoku Mahouka Koukou no Rettousei: Magian Company

Kuro no Senki: Isekai Teni shita Boku ga Saikyou nano wa Bed no Ue dake no you desu

Accel World

Nogizaka Haruka no Himitsu

Asura Cryin'

The Melancholy of Haruhi Suzumiya

Slime na Dungeon kara Tenka wo Torou to Omou

Oogimachi, Kakukatariki!

Isekai Meikyuu no Saishinbu wo Mezasou

Kono Subarashii Sekai ni Shukufuku wo!

The Case Files of Lord El-Melloi II

Sword Art Online Progressive

Yume Miru Danshi wa Genjitsushugisha

Classroom of the Elite: Second Year

Overlord

Shakunetsu no Kobayakawa-san

Shinitagari na Shoujo no Jisatsu wo Jama Shite, Asobi ni Tsureteiku Hanashi

Is It Wrong to Try to Pick Up Girls in a Dungeon?

Kyokou Suiri