[DreadBringer]

Getting more about Fuga.

Guess the story actually addressed that Rinne is cold to Hotaro (albeit no longer condescending as in ep. 1, even to his cooking at the end), with Hotaro asking her it. Later Lachesis revealed that Fuga is apparently murdered. Previously there are some saying that Rinne's acting is stiff, but it can be perhaps just her type of personality (which as said here, also addressed that she's cold), but perhaps it'd be true in her reaction of hearing her father's death of being more of regular confusion (other than shutting down, with Hotaro dragging her along as usual), despite Lachesis gloating over her despair, albeit later she does shed tears.

Her father's teachings was to put rules above anything, while he himself breaks it. Growing up she now claims that she has no purpose to live unlike Hotaro, and she just performs alchemy for duty. Though performing her duty would benefit others, she does lose sight, with her child self claiming that her goal is the Kamen Rider sensibility of making everyone smile. Rules aren't be all end all of anything, so this'd be a case of child misblaming the parent, being lawful can block goodness (I prefer good) in making everyone smile. Maybe like the Chemies itself. The type to snap out of her funk by re-remembering her original purpose, saying she likes seeing her father smile.

It's lucky for Hotaro to accept Renge's deal this time as, they're only borrowing Kamantis and they'd return it later, so Hotaro gets 2 more Chemies without paying. Hotaro's empathy wins him over again here when he pretends to give up his Gotchardriver to Lachesis, only for the Chemy he befriended (and traded), Energyl to attack her and foil her plan. Hotaro's cooking actually fails here as it's not Rinne's taste....

Not unlike Submarine Malgam (but in less creepy way).... Spanner apparently has an interest to Rinne as well, her being his soft spot and the only one he's courteous at. At the end, so alchemy has its limits as Rinne showed, thus reducing it being broken and all solving, requiring Spanner to let Hotaro borrow Madwheel to free themselves.