2girls close game_cg happiness!_2_re:lucks hug ichijou_kazuki ko~cha male tachibana_mion windmill_oasis

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So apparently her name is either "Tachibana Mion" or "橘 海音" (Tachibana Kaine)

I always get confused with these names and which one to choose. source: https://vndb.org/v27053/chars
It's Tachibana Mion. Where did you get "Kaine"? You didn't link to that source.

99% of the time, vndb will give you the correct name. If in doubt, just google the Japanese name of the game. The developer's website for the game should be one of the first results. 1000 to 1, there will be a characters section that will show the correct reading for the character in question. (NOTE: If the reading is romanized rather than using Hiragana or Katakana, they may have swapped the name order)
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