Widow's Boarding House in order
The "Widow's Boarding House" series by Nikkatsu. All are independent productions that were directed by Shinya Yamamoto and bought/distributed as "Roman Porno." Two of these films are also a part of the "Semi-Documentary" series. 16 films, 17h 55m in all, in release order.

Semi-Document: Widow's Boarding House
1974 · 67 min
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Zoku mibōjin geshuku: omote mo kashimasu ura mo kashimasu
1975 · 68 min
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Semi-dokyumento: shin mibōjin geshuku
1975 · 68 min
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New Widow Boarding House: Back Room for Rent
1975 · 69 min
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New Boarding House Widow: I Can Cum Right Away
1976 · 67 min
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Shin mibôjin geshuku: Iroiro oshiemasu
1977 · 67 min
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Mibōjin geshuku: Shitamo kashimasu yojōhan
1977 · 71 min
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Mibôjin geshuku: Tadanori
1978 · 67 min
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Mibôjin geshuku: Hatsunori
1978 · 67 min
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Mibōjin geshuku: Norinige
1979 · 65 min
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Mibôjin geshuku: Hatsunaki
1979 · 66 min
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Mibōjin geshuku: Anomichi kono michi oshiemasu
1980 · 68 min
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Mibōjin geshuku: Hatsu nurashi
1980 · 64 min
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Shin mibôjin geshuku hatsu hiraki hatsu ire
1981 · 63 min
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Mibôjin geshuku: anata mo kashimasu hatsu ijiri
1983 · 64 min
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Kyoko Aizome's Widow Boarding House
1984 · 74 min
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Frequently asked questions
What order should I watch Widow's Boarding House in?
1. Semi-Document: Widow's Boarding House (1974), 2. Zoku mibōjin geshuku: omote mo kashimasu ura mo kashimasu (1975), 3. Semi-dokyumento: shin mibōjin geshuku (1975), 4. New Widow Boarding House: Back Room for Rent (1975), 5. New Boarding House Widow: I Can Cum Right Away (1976), 6. Shin mibôjin geshuku: Iroiro oshiemasu (1977), 7. Mibōjin geshuku: Shitamo kashimasu yojōhan (1977), 8. Mibôjin geshuku: Tadanori (1978), 9. Mibôjin geshuku: Hatsunori (1978), 10. Mibōjin geshuku: Norinige (1979), 11. Mibôjin geshuku: Hatsunaki (1979), 12. Mibōjin geshuku: Anomichi kono michi oshiemasu (1980), 13. Mibōjin geshuku: Hatsu nurashi (1980), 14. Shin mibôjin geshuku hatsu hiraki hatsu ire (1981), 15. Mibôjin geshuku: anata mo kashimasu hatsu ijiri (1983), 16. Kyoko Aizome's Widow Boarding House (1984).
How long does it take to watch all of Widow's Boarding House?
About 17h 55m across 16 released films.
Do any Widow's Boarding House films have post-credit scenes?
None are listed on TMDB.