I/O: Difference between revisions

The game was originally released on the [[Play Station 2]] in 2006, but was given an [[Updated Rerelease]] on the PC two years later, with new CGs and slightly updated artwork.

* [[Ambiguous Gender]]- Enlil, who is never specifically identified as a man or a woman. {{spoiler|Route E finally confirms that Enlil is a woman.}}

* {{spoiler|[[Angsty Surviving Twin]]}} {{spoiler|Mayumi, though notable in that she seems to treat her sister's death on equal level with the rest of her comrades' deaths.}}

* [[Bolivian Army Cliffhanger]]: If you haven't cleared the routes required to see their full endings, Route B and C end this way.

* [[Brilliant but Lazy]]- Hinata is very intelligent and is shown to be able to solve complicated problems in seconds, but he's so apathetic towards life that he's just not interested in it (much to Sakuya's consternation).

* [[Butt Monkey]]- Kosuke, who seems to exist to get verbally abused by the other members of Criminal.

* [[Chekhov's Gun]]- {{spoiler|Some seemingly throwaway bits of conversation between Hinata and Yayoi early in Route A turn out to be vital in figuring out the mystery later on.}}

** Specifically, there are initially four routes. Sounds simple enough. What the game doesn't tell you is that you have to get a certain other ending to see the full ending of another route. If you don't, then you are left at a "cutoff point", which seems like the ending, but isn't. (In order to see Route A's full ending, you have to clear Route C, Route D must be cleared to see Route B's full ending, Route B needs to be cleared for Route C's ending, and Route A needs to be cleared for Route D's ending). Then you unlock Route E, which, if you clear that, opens up four new routes which must be cleared, and it is then and only then that you can see the True Ending. Sound complicated?

* [[Gun Porn]]- One scene in particular in Route D is practically devoted to discussing the specs of "He"'s weapons in great detail.

* {{spoiler|[[Heel Face Turn]]}}- {{spoiler|Enlil.}}

* [[Heroic Sacrifice]]- {{spoiler|Subverted in Route B': Ningirsu attempts to do this by letting his teammates go ahead while he's stuck next to dynamite, but it's subverted when the sprinklers in the building activate, defusing the dynamite.}}

** Perhaps due to Romeo Tanaka's influence, this game shares several voice actors with [[Yume Miru Kusuri]], such as Michihiko Hagi (who voices Hinata in I/O and Takeshi in YMK), Ryoko Tanaka (who voices Sakuya in I/O and Mizuki in YMK), and Kayo Nagata (who voices Mutsuki in I/O and Nekoko in YMK). Incidentally, the two games were released a month apart from each other.

* [[Hope Spot]]- {{spoiler|At the end of Route B, it looks like Criminal and the others are finally going to make it to the helicopter pad... and then Hinata's father gets shot. [[Downer Ending|It all goes downhill from there.]]}}

* [[Inferiority Superiority Complex]]- {{spoiler|Masami, who's haughty attitude is used to hide the fact that she feels inferior to her sister Mayumi, who is more loved by the rest of the members of Criminal. Ironically, Route C' reveals that Mayumi also felt inferior to Masami.}}

* [[Its Not You Its My Enemies]]- {{spoiler|Hinata uses a variation of this to leave Sakuya.}}

* [[Japanese Ranguage]]- Actually used as a plot point once. {{spoiler|When trying to solve Mutsuki's crossword puzzle, Hinata can't figure out the clue for the word "Lunar Excursion Module" due to the lack of an L in Japanese, and so is stumped until Mayumi helps him. She even lampshades the trope.}}

* [[Journey to The Center of The Mind]]- {{spoiler|Hinata and Mayumi have to do this to awaken Mutsuki by diving into her brain in the Enigma system. However, this gets them trapped into an infinite loop by "Marduk".}}

** {{spoiler|Several bad endings also count.}}

* {{spoiler|[[Legacy Character]]}}- {{spoiler|Ishtar becomes this, with Mayumi taking up the role of "Ishtar" after Route B.}}

* [[Les Yay]]- Mika seems to look up to Ishtar a little ''too'' much at times, with later routes making it quite clear that she views Ishtar as more than just a friend. {{spoiler|In a serious, canonical example, Enlil and Mutsuki are in love with each other.}}

* [[Meaningful Name]]- Several, some of them Lampshaded in-story, while others come from [[Word of God]]:

** When reversed, the kanji in Hinata Aoi's name forms the kanji for "sunflower".

* {{spoiler|[[Victorious Childhood Friend]]}}- {{spoiler|Sakuya in Route A'.}}

* [[Virtual Ghost]]- Shadow Nulls, who are essentially the remainders of someone who used [[Cyberspace]] frequently, and can continue to live after death in that world, but cannot interact with the real world unless they have someone living to do it through.

* [[Yandere]]- {{spoiler|Enlil, who's ''very'' possessive of Mutsuki.}}