Sefure to Koibito no Kyoukaisen

Drama·セフレと恋人の境界線·The Borderline Between Friends with Benefits and Lovers
Sefure to Koibito no Kyoukaisen
2025/09/03
Speech time
3h 46min
Word count36,881
Unique words
2,589
Unique kanji
850
Avg. sentence7.4
Speech speed
341
Difficulty Easy
Episodes7

The subject of "Are we friends with benefits (FWB) or are we in a real relationship?" is tackled in this series of seven episodes.

Genres
Drama
SourcesTMDB

Japanese study overview

Sefure to Koibito no Kyoukaisen is a Japanese drama of 89,844 characters, with 2,589 unique words and 850 different kanji. Its difficulty rating on Jiten is easy, 1.8 out of 5. The full vocabulary list ranks all 2,589 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.

Episode 1

Speech time
31min
Word count5,449
Unique words
1,060
Unique kanji
428
Avg. sentence6.9
Speech speed
352
Difficulty Easy

Episode 2

Speech time
35min
Word count6,501
Unique words
1,229
Unique kanji
522
Avg. sentence7.8
Speech speed
369
Difficulty Easy

Episode 3

Speech time
34min
Word count6,948
Unique words
1,090
Unique kanji
481
Avg. sentence7.2
Speech speed
358
Difficulty Easy

Episode 4

Speech time
41min
Word count8,092
Unique words
996
Unique kanji
412
Avg. sentence6.5
Speech speed
335
Difficulty Easy

Episode 5

Speech time
24min
Word count2,831
Unique words
789
Unique kanji
321
Avg. sentence8.7
Speech speed
316
Difficulty Easy

Episode 6

Speech time
21min
Word count2,647
Unique words
798
Unique kanji
377
Avg. sentence9.1
Speech speed
339
Difficulty Easy

Episode 7

Speech time
36min
Word count4,413
Unique words
784
Unique kanji
328
Avg. sentence8.7
Speech speed
312
Difficulty Easy

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Vocabulary highlights

Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.

See the full vocabulary list (2,589 words) →