Collect all the hidden money in all locations, then in the cheat menu, enter the code you needed.
Cheat codes: (0.4.91)
more = +5000¥
SexyLady = Yasuka always wear babydoll.
MilfIsLife = Yasuka nude mode.
VanillaYasuka = Yasuka default outfit.
PyjamaParty = Noriko always wear pyjama.
TsundereIsLife = Noriko nude mode.
VanillaNoriko = Noriko default outfit.
WaitThatsIllegal = Chiaki nude mode.
PureTomboy = Asami always wear her jacket.
MidTomboy = Asami without ugly jacket.
WhatIsThat = Asami always wear ugly dress.
TomboyIsLife = Asami nude mode (doesn't work at 0.4.91)
VanillaAsami = Asami default outfit.
OppaiIsLife = Sakuya nude mode.
VanillaSakuya = Sakuya default outfit.
NetoriIsLife = Natsume nude mode.
VanillaNatsume = Natsume default outfit.
MacumbaEverywhere = Try this, trust me.
Cheat code 0.5.9
more = +5000¥
MacumbaEverywhere = Try this, trust me.
Old codes will no longer work because skins are no longer activated with codes