Trying to gather up some stuff here:
To get skills, complete first few quests to gain skillbook. Then you need levels and skillpoints to buy skills from the menu. Skillspoints can be earned from the crystals you get from here and there, often as reward from quests. (you need to use the crystals from your inventory in order to get the skillpoints.)
To get Fallen konoha: Get corruption and karma to maybe 50 and 150? and give birth to demon beast.
To get lolimons: See map 2nd floor of guild hall, southernmost NPC(also get 1 freebie). Free lolimons in caves by beating nest stone boss nearby their prisons.
Do not give birth to human babies, or you will lose powers and lolimons, and wont be able to proceed. By getting the holy stone or whatever you can keep powers while giving birth.(long quest chain of helping a guy, starts in underground slums) OR get fallen konoha and you wont lose powers, though you reset to lvl 1 and lose skills when falling, you can still lvl up.
To unlock locked chests, need hairpins and lockpick found in chest outside the starter town wall, to the left mostly behind trees.
To open chests with vines, need lolimon with fire skill (imp is probably the first) Some need higher level fire, lvl up lolimon and do their quest by talking to them in guild house.
Some places need survey skill to access.(you get a popup that you need it when trying to interact)
Similar case for diving/swimming.
You can also speed up movement in map at cliffs or water by using skill from lolimon (dragon flight skill to speed up climbing, swimming skill from some lolimon to speed up swimming.)
To seduce people with hearts swarming around them you need some lewdness, and pick the right approach.(might need some h-skills?)
H-skills give bonuses prostituting at the brothel, and you can use them to fight back when being combat raped.
To be able to prostitute at brothel, check the house for sale poster SW area of underground, go to bar and speak to the guy behind owner, ask about how to make the house cheaper.(10 days of whoring gets you house for free.) You can get gangbanged when sleeping at slum house.
To get H-skills complete sidequests to get a title and then buy skill like normal
To steal complete quest in underground slum. Another quest from same guys gets you unlock skill to ease lockpicking.
atleast the main Bosses have defeat H-scenes, some minibosses and even normal bandits aswell.
If you have been good girl and get captured by bandits, sleep one night and you get rescued. If not, you have to buy or seduce your way out.
AVOID GETTING CAPTURED IF YOU ARE ALREADY PREGNANT