FID:240370, there is no softsub -- everything is hardcoded in videostream.
The other eps (1-4) on the other hand do have softsub -- it is probebly a miss by the encoder to hardcode the subtitles in this ep.
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$ wine ~/Desktop/avdump/avdump.exe ep5.mkv
ep5.mkv
Duration: 24:30 (1469.84)
Track #1: video
lang: English (default) (4)
codc: V_MS/VFW/FOURCC H264 -> H264/AVC (22)
reso: 640x480 (640x480) -> 4:3
fram: 23.976 fps
rate: 670 kbps (670.077)
dura: 1469.8 sec
size: 123109865 B (117.407 MB)
Track #2: audio
lang: English (default) (4)
codc: A_MPEG/L3 -> MP3 CBR (5)
chan: 2 -> Stereo
samp: 48000 Hz
rate: 128 kbps (128.013)
dura: 1469.71 sec
size: 23517696 B (22.4282 MB)
Sizes: (check sanity)
disk: 147238103 B (140 MB)
trac: 146627561 B (139 MB) [based on track size]
bitr: 146633160 B (139 MB) [based on bitrate]
tdif: 610542 B (596.232 KB) 0.41% (overhead?)
bdif: 604943 B (590.765 KB) 0.41%
OK 0.15 - 060518
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[DEL][SUB-STREAM] No softsubs in Kamisamma Kazoku 5 by orz
Moderator: AniDB