i'd say that so far, Tatarigoroshi is indeed the best chapter; no doubts about it. i love how every conclusion you get this chapter can be considered pretty much a cointoss since you can't actually prove most of your conclusions (that happened to me, maybe i'm just stupid)

really, really liked it. if i rated my played games, i'd definetely give this a 3.5; i loved how i legitimately sympathized with Satoko's struggle... the last chapters (7 to 13) really pick up in pace and don't stop getting better... the ending also surprised me a lot.