HD 720p from official website. No watermark version.

General
Unique ID                      : 266339650366282579378547358085382185805 (0xC85F269AF274D882A3F2658E8BACA34D)
Complete name                  : [MagicStar] CHEAT - Chain Story 7.5 [WEBDL] [720p].mkv
Format                         : Matroska
Format version                 : Version 4
File size                      : 137 MiB
Duration                       : 6 min 6 s
Overall bit rate mode          : Variable
Overall bit rate               : 3 128 kb/s
Writing application            : Lavf57.48.101
Writing library                : Lavf57.48.101

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : Main@L3.1
Format settings                : CABAC / 3 Ref Frames
Format settings, CABAC         : Yes
Format settings, ReFrames      : 3 frames
Format settings, GOP           : M=1, N=30
Codec ID                       : V_MPEG4/ISO/AVC
Duration                       : 6 min 6 s
Bit rate mode                  : Variable
Maximum bit rate               : 40.0 Mb/s
Width                          : 1 280 pixels
Height                         : 720 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 29.970 (30000/1001) FPS
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Default                        : Yes
Forced                         : No
Color range                    : Limited
Matrix coefficients            : BT.709

Audio
ID                             : 2
Format                         : AAC LC
Format/Info                    : Advanced Audio Codec Low Complexity
Codec ID                       : A_AAC-2
Duration                       : 6 min 6 s
Channel(s)                     : 2 channels
Channel layout                 : L R
Sampling rate                  : 48.0 kHz
Frame rate                     : 46.875 FPS (1024 SPF)
Compression mode               : Lossy
Default                        : Yes
Forced                         : No