Since this specific file mentions "SUB ITA," it likely originated from an Italian fansub group (such as Chokoreto Fansub or similar groups active during the series' release). Checking their archives would provide the exact script used in your video.
If you are looking for the literal transcript or subtitle text from that specific MP4: Yuyushiki_Ep_12_SUB_ITA.mp4
You can often find .srt or .ass subtitle files by searching for "Yuyushiki Episode 12 Italian Subs." Since this specific file mentions "SUB ITA," it
True to the "slice-of-life" genre, the series ends without a massive climax. Instead, it finishes on a heartwarming note, showing that their "normal" days will continue as they move into their next year of school. Where to find the text/subtitles it finishes on a heartwarming note