A fun bit of trivia: there's a question that constantly gets brought up in the story but never resolved, where did the box come from, there's legend that you get told bits and peices of in every route that never seems to really be relevant about a time paradox in which tossing an item into the lake with thoughts of helping a loved one can change the past because god will intervene, and the start is about how the protagonist was suicidal and saved thanks to a friend he made years ago thanks to the box, most likely Ria would've found out if something happened to the protagonist via the protag's family and been the one to toss the box into the lake, an original timeline that takes place before this game takes place, and in the true route it ends with the protagonist tossing the now slightly altered box into the lake with similar sentiments and his past self discovering it, likely causing a slightly different miracle to transpire as well. This game is about Ria's wish, and the sequel (aka: fan-disk) seems to be about the protagonist's wish.