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· Tsukuyomi appears as a child actor in the middle of the story when the movie '15-Year Lie' begins production.
· Her true identity was a crow that Goro and Sarina (Aqua and Ruby's previous lives) had saved in the past.
· When Sarina was hospitalized, Goro treated a crow that was caught in a net and injured, and that crow watched the two from outside the hospital window until Sarina died.
· There is a description that this crow was nearby even at the moment Goro fell off a cliff and died.
· In other words, the easiest interpretation is that the crow saved by Goro and Sarina reincarnated into the girl Tsukuyomi.
· The crow's model is the Yatagarasu from Japanese mythology, known as the 'God of Guidance' who led Emperor Jimmu on the right path in mythology.
· In the story, Ruby says, 'I am the incarnation of Amaterasu,' and the dynamic of Tsukuyomi, the crow, guiding Ruby, the idol who shines like the sun goddess Amaterasu, directly follows the myth.
· Tsukuyomi herself emphasizes her role as a god of guidance, saying, 'I guided the two who never truly had a mother and the mother who gave birth to soulless children.'

· In the novel 'The Two Etudes', new facts about Tsukuyomi's true identity were revealed.
· Tsukuyomi is a 'flesh-and-blood human' born into the prestigious 'Shake' (社家) family.
· 'Shake' refers to a clan that has served the gods of shrines for generations.
· The fact that Tsukuyomi is human can also be confirmed by her appearance as a child actor in the movie '15-Year Lie'. Movie appearances require legal procedures, and ghosts or hallucinations cannot sign contracts.
· Thus, it is confirmed that she is a socially existing human with a family register and a physical body.
· The 'Shake' setting becomes important in explaining why she acts like a god.
· If we assume that this clan possesses an incredible secret art of 'implanting the memories of the dead into newborns', everything makes sense.
· Tsukuyomi did not grow up as an ordinary child with her own personality, but rather as a being who had 'god-role' memories and data, inherited from her ancestors, 'installed' in her brain from birth.
· She is like a 'state-of-the-art computer' with hundreds of years of divine memories and knowledge inside a modern child's body.
· The setting of her having no name can also be interpreted as her role as a 'vessel for a god' taking precedence over her personal life.
· Her cryptic line, 'God must be kind. I guided the two who never truly had a mother and the mother who gave birth to soulless children,' might sound like mere self-praise.
· Goro and Sarina were beings who never knew a mother's love, having lost their mothers or been neglected. Tsukuyomi is boasting that she matched them with 'the ultimate idol and best mother' in the form of children.
· The phrase 'mother who gave birth to soulless children' is also important. If reincarnation hadn't happened, Ai's children would have been like soulless dolls. But by reincarnating Goro and Sarina, Ai was able to hold healthy children, and her 'Oshi' could become Ai's children.
· This can be seen as an excuse or justification for her actions, implying, 'I didn't take anyone's life to reincarnate them. No one lost out.'
· Regarding the fact that it ultimately became a revenge story, she also seems to evade responsibility by saying, 'Well, that's fate, I guess.'

· If Tsukuyomi is human, what was the crow that Goro and Sarina saved?
· The most appropriate idea is that it was 'another form of the previous Tsukuyomi'. That crow was like an 'avatar' of the previous Tsukuyomi.
· It's not strange to think that her clan was well-versed in the occult and could use magic to possess animals.
· The previous Tsukuyomi was exploring the outside world in the form of a crow, got caught in a net and couldn't move, and was helped by Goro and Sarina. This was a fated encounter.
· To the previous Tsukuyomi, the two became saviors and, at the same time, her 'Oshi' whose lives moved her.
· Later, when Goro and Sarina died tragically, the grief-stricken previous Tsukuyomi used her clan's secret art, 'memory implantation magic'.
· Driven by a fan's ego and wish that her 'Oshi' would be happy if they were reborn as the children of their favorite idol, she guided their souls into Ai's fetuses. If we consider this the truth of reincarnation, everything makes sense.
· After that, the previous Tsukuyomi also died of old age, and her memories and role were inherited by the current Tsukuyomi.
· That's why the current Tsukuyomi, although she didn't do it herself, perceives and says 'I guided them' because of the previous one's memories.

· However, the problem here is the current Tsukuyomi's 'lack of tact' and suspicion of 'incompetence'.
· Ruby's descent into darkness can be attributed to Tsukuyomi. In a sense, she is the 'root of all evil'.
· Let's recall the scene after Goro's ashes were found, where Ruby tried to take Ai's merchandise from the ashes.
· Tsukuyomi suddenly appeared and said, 'No, no. You took that from the ashes. You shouldn't do that,' provoking Ruby.
· While it seemed like she was provoking her, Tsukuyomi's true intention was different. What she really wanted to say was, 'That's Goro's keepsake. Show it to Aqua quickly. Then Aqua will immediately know that it could only be Sarina.'
· In other words, she was aiming for a happy ending through their past lives.
· Her subsequent line, 'A famous idol had a secret birth a long time ago, and her doctor went missing at that time. The day the idol gave birth and the day the doctor disappeared are the same,' was also a hint.
· She wanted to say, 'Aqua was born the moment Goro died. Come on, figure it out, figure it out!'
· From Tsukuyomi's perspective, it was a brilliant divine hint, but she fatally failed to understand 'human emotions'.
· Such an indirect riddle would never work on Ruby, who was in mental breakdown after her beloved teacher was found as a skeleton.
· Ruby interpreted it as, 'There was a suspicious man on the day Sensei died. A middle school-aged man? Is he the culprit? Revenge!'
· Tsukuyomi's careless interference led to Ruby's descent into darkness. She was, quite literally, 'incompetent'.

· Despite acting so serious, the self-proclaimed god Tsukuyomi's treatment completely changes from the latter half of the story, which is an amusing part.
· As the movie '15-Year Lie' begins production, she is instantly demoted to a 'gag character'.
· Her reaction when Aqua asks, 'Would you like to play the child role in this movie?' is priceless.
· From this point on, Tsukuyomi is completely ignored by Aqua.
· Even when Tsukuyomi tries to show dignity, saying, 'Who do you think I am?', Aqua dismisses her with 'I don't know.'
· Even when she tries to continue saying, 'You are not someone you can lightly negotiate with,' Aqua brushes her off with 'Oh, really.'
· When a flustered Tsukuyomi threatens, 'If I wanted to, I could take your soul with just one finger,' Aqua doesn't humor her, saying, 'Enough, don't say such things.'
· When she tries to refuse, saying, 'Entertainment is not my domain,' Aqua tells her, 'If you can't do it, say you can't. Say, 'I'm sorry, I'm not skilled enough to do it.''
· At this, the self-proclaimed god explodes, saying, 'Huh? I can do it! Don't underestimate me!' and eventually appears in the movie.
· Around this time, it becomes clear that the author also began treating her as a 'convenient and cute mascot character'.

· Finally, let's summarize Tsukuyomi's purpose and reason for being.
· Her principle of action is 'a fan's ego'. She didn't have a grand plan.
· She simply wished for her 'Oshi', Goro and Sarina, who met tragic deaths, to be happy, and reincarnated them out of a simple wish.
· Her position can be summarized as 'an absolute affirmative and full supporter of her Oshi's will'.
· Normally, if an 'Oshi' said they wanted revenge and to die, people would try to stop them. But she was different.
· If Aqua wanted it, she chose to fully cooperate from behind to ensure that wish was beautifully fulfilled.
· In the final battle, when Hikaru Kamiki was dragged into the abyss, a mysterious hand appeared. There was also the significant detail that Aqua's body was found undamaged. These were likely Tsukuyomi's doing.
· Fulfilling her 'Oshi's' wish, even if it leads to destruction, is her unique form of love and a kind of cruelty.
· This is because she was the one who persistently questioned Aqua and his group about 'meaning to live' and 'roles' that they shouldn't have had to worry about, mentally cornering them.
· If she hadn't meddled and had simply reincarnated them and left them alone, the two might have found more ordinary happiness sooner.
· 'A powerful otaku girl who wants to play god' – that was Tsukuyomi's true identity.