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Bottom center page 2: You'll need to visit the garden a few times, and Rika will invite you to visit her at night.  You'll eventually get to take her to the festival. You'll have to buy her a dress for the event ($1000). Go through the scenes, and be supportive.  Afterwards, you'll decide to "do something nice for her".  Go to the church, ask about the lighthouse, and make a anon donation to support it.  She'll invite you to visit her, and from then on you can visit her at night to repeat that scene.
Bottom right page 2: After you have gotten the previous scene, you'll need to keep interacting with her. You'll need to build up her "love" for you (help her in garden a lot).  You'll get to flirt, and setup lewd events (garden naked, bathe in hot spring together, etc). Then she'll ask you to pick up a "special" garment for her ($1000 if I remember right).  That night, go visit her, and she'll model the outfit before you get to take her from behind.  From then on, you can visit her at night to repeat the anal sex.

Left page 3: I don't recall the specific trigger for this one, and I apologize, but I just know that there are three variants of it.  You'll need to have her "love" score above 20 (I think), and visit the kitchen in the daytime with full energy (it never seemed to work when my energy was low or empty).  The three variants you get (and which don't appear to be repeatable) are: She gives you a blowjob for helping her with the groceries in the morning, She gives you a blowjob for helping with the groceries and Cece wanders in (she doesn't stop), and She gives you a blowjob for helping with the groceries and the daughter (forgot her name) wanders in (she doesn't stop).

That's all I can recall.  Honestly, I still haven't figured out how to get page 2 bottom left.  I can't seem to get any of them to repeat, or to be able to interact with the daughter at ALL outside the beginning or in another characters scenes.  I can "breed" with Cece in the pit, but that is it.  The vast majority of filled story seems to be Kira, with a decent amount for Cece, but that is it.  I'm still enjoying messing around, and breeding up good variants of the various monsters, but I wish we could intentionally trigger some additional or repeats of more of the other events.  Like card night with Cece and the barmaid, or things like that.  Single use triggers are understandable since we can "replay" from the gallery.  Oh well.  Maybe with a future update!  Cheers!