High quality trainer-game that's actually worth your money.
+
One handed gameplay: Game is 100% playable with one hand.
Tons of options: Various toys and service positions.
Dialogue that changes with hypnosis level and type: Yup, the extent of hypnosis and type will affect Reimu's dialogue and it's really good.
Voice acting: Top notch.
Scenes/Situations: Quite a few, more unlock as you progress further. Makes progression worthwhile.
Modifications: Modifications range from breast size , clothing changes to futanari, there's really quite a few options.
Story: Not much to say here. Simple and straight to the point, great if you just want to fap.
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Grindy: Took me up to New Game +2 to finally hit the final hypnosis level that doesn't trigger the bad end. There'll be alot of clicking you'll need to do to get to the good end and it really takes awhile. Though it's offset partially by the progression being worthwhile.
Lack of actual sex positions: While i mentioned a ton of options, end of the day there's only really 3 sex positions: Missionary, Cowgirl and Doggystyle. Cowgirl and Doggystyle can only be viewed during scenes. Missionary is the default and only sex position in the training portion of the game
Messy UI: Playing for the first time, you'll be intimidated by the various stats and options. Entire UI feels messy and could have been organized better. For example to check what requirements you need to raise a certain stat level, you have to compare the requirements, to the mess of text at the top of the option box, it gets really annoying at times.
Summary/TLDR:
Despite its flaws I cannot give this any less than 5/5. It is grindy yes, but the grind is tied to the sex, there's no pointless quests or irrelevant bloat quests to artificially inflate playtime. Progression is tied to sex and it is worth it.