Jackosan is probably right, many similarities but also differences after rebuilt

Kanji at the bow is not clear enough to read, but has nothing inconsistent with the 開洋丸 of KAIYO MARU. I also see no major changes from the configuration of the BRADBURN that couldn't have been accomplished with simple, sheet metal alterations.

I think it actually could the KAIYO MARU, built 1930 as the BRADBURN for Leeds Shipping Co. Ltd., Cardiff, which was converted to a crab cannery ship in 1955 by NICHIYO FISHERY Co. & scrapped in 1967. Here's the Google-translated details from the Japanese website page http://jpnships.g.dgdg.jp/senreki03/009181.htm:
Ship number 68737 Signal character JJIN Steel cargo ship 4,963 gross tons, 8,920 deadweight tons
Flooded 1930.3.4 (Showa 5) Completion 1930.4 (Showa 5)
Inch method Lpp 122.04 B 16.47 D 8.55 m
Main engine R 4 connected to 2,700IHP 1 base speed 9/9.5kt
built by William Gray & Co. Ltd., owner of West Hartlepool Sno.1035
Leeds Shipping Co. Ltd., Cardiff
ship name BRADBURN
for reference SCAJAP No.K372
1952.2(Showa 27)Sold to Taiheiyo Kaiun Co., Ltd. (Tokyo) and renamed Kaiyo Maru
1955.3.12(Shao 30)Sold to Nichiro Fishery Co., Ltd. (Yokohama). Remodeled into a crab cannery ship
1967.11.16(Showa 42)Completed dismantling in Yokosuka
This looks basically like the photo of BRADBURN on this site (plus additional structures); the problem is that the photo purported to be the KAIYO MARU on the site is clearly a very different vessel.

KAIYO MARU ex BRADBURN (1930) converted in crab cannery don't match : https://reardonsmithships.co.uk/bradburn2001.php
YOKO MARU ex CANADIAN FREIGHTER (1921) converted in crab cannery don't match : https://www.shipspotting.com/photos/1654588?navList=gallery&imo=5395888&page=1&viewType=normal&sortBy=newest

It looks very similar to the TOKEI MARU but it is not exactly the same, some differences in the superstructure, this a "Hog Islander" standard vessel, so there must be another of this class been used by the Japanese and rebuilt as a crab cannery, but which one ?

Agree with Dmitriy.
The company could be Hokuyo Suisan KK.
Found :
TOKEI MARU (No. 1 on hull) http://2.bp.blogspot.com/-n2e4gTIcwGE/UDvnHZtb8UI/AAAAAAAAKb8/2UC9QRqNCG4/s1600/Tokei+Maru-+Apr+24+1960-6.jpg
SEIYO MARU (No.8 on hull) https://www.shipsnostalgia.com/media/seiyo-maru-arr-yokohama-27-mar-1962.43212/

Puzzle for No.3 ...

My guess this ship is a fish processing plant. The enclosure on the top of the ship might be a storage place for wooden crates.

Can be crabber.

A rather specific ship, based on what I can read on the bow KAIZO or KAIYO MARU could be a name, except that KAIZO MARU was a 1958 built tanker that exploded in 1965.