はなれる (romaji: hanareru) means to be apart (はなれず, hanarezu, is a negative form), and could be written in kanji as either 離れる or 放れる. The former implies a physical or metaphorical separation from something or someone, while the latter connotates being freed or released from something. Since the title is written out in hiragana, the precise meaning is left ambiguous, or looking at it another way, the word can encompass both meanings.
A much better translation than mine here is now available for purchase directly from the artist's Pixiv BOOTH: https://booth.pm/en/items/3662819 It's only 400 yen (less than 4 US Dollars) and comes DRM-free as a fully typeset pdf, so please consider supporting the artist.
