FAQ:
Credits to Greywraith for most of it.
How do I seggs?
Build up affection until she kisses you in bed. This enables Skills which allows you to buy H.
When doing H:
Rub her pussy and alternate between her head to lower alertness. You will gradually be allowed to remove articles of clothing by then. Once you can set aside her panties, you can wake her up without repercussions.
How do I get the event memories?
1. After building your relationship enough, peek on her at the bath.
2. With enough lewdness and higher relationship, she will wear this in the kitchen, talk to her.
3. With enough lewdness, go to your bedroom and a "take a break" option can pop up over the bed during the day, click on it.
4. You might find her on the couch sometimes, just click on her and press tease.
5. After building up your relationship, you get a mail about the beach, talk to her about it and you can travel there early in the day, do this repeatedly and the scene unlocks.
6. With enough lewdness, press "outing" but instead of going anywhere, just go back home and you will find her masturbating in your bedroom if you go there.
7. With enough lewdness and if she keeps being horny, you might find her masturbating in her own bedroom, do this repeatedly until you get the option to walk in on her.
8. High enough lewdness and after buying a lewd movie, late at night you can watch that lewd movie with her. (Alert, This scene seems to be bugged as of 1.0 for many players. To bypass this, load the scene but immediately alt-tab. Wait for a few seconds then tab back in. You should load the scene where the animation is frozen. Exit out and you should be able to unlock the scene for later viewing.)
9. After building enough relationship, lewdness and getting the skills, you get mail about the Onsen, you must buy the tickets and the store and the options will appear early in the day.
How do I get the password?
Complete all note events except the one that says "taking a walk is nice sometimes". View the chain of events related to it, and then fish the password. The contents are a continuation of this event.