Amaterasu, ruler of the heavens, hides within her cave to plunge the world into darkness, then reappears to bathe it in light. She is the literal embodiment of the sun shining down on the world. 
Another Year Together
Hikari: ............
Karen: Ngh... No, Hikari-chan! Don't go...
Hikari: ......?
Karen: Mt. Fuji is...too dangerous... without an...oxygen tank...
Hikari: Are you talking in your sleep?
Hikari: That sounds like some dream, Karen.
Hikari: But it's not safe to walk around unconscious. Time to wake up.
Karen: Wha...?
Karen: Hikari...chan?
Hikari: Finally awake?
Karen: Ugh, my eyes are all bleary...
Karen: Huh? Wait this isn't my room.
Hikari: You don't even remember getting out of bed?
Karen: I remember it was past midnight when I got in it. I'm sooo sleepy...
Hikari: This might help with that.
*swish*
Karen: Gah!? It's so bright!
Hikari: You're the one who wanted to see the first sunrise of the year.
Karen: ......! Ohh, RIGHT! So that's why you brought me here!
Karen: Thanks, Hikari-chan!
Karen: *squeeze*
Hikari: K-Karen! Is something wrong? I appreciate the hug, but...
Karen: I'm holding onto you so you don't fly away.
Hikari: What are you talking about?
Karen: So, in my dream, you sprouted these HUGE wings!
Karen: And you flew off to Mt. Fuji like WHOOSH!
Hikari: Is that why I needed an oxygen tank?
Karen: Oh? Wait, how do you know that!?
Hikari: You were talking in your sleep. Loudly.
Hikari: "No, Hikari-chan! Don't go..."
Hikari: "Mt. Fuji is...too dangerous... without an oxygen tank..."
Hikari: And...scene.
Karen: Hey, c'mon! It's not MY fault you insisted on eating mapo eggplant on top of Mt. Fuji!
Karen: Or that Kaoruko-chan's folding fans were spinning all over the place, OR that a giant Tendo-san lumbered out of Mt. Fuji's shadow...
Karen: Or that... That... Look, a lot things happened, okay!?
Hikari: That's a strange dream.
Karen: Yeah, but thinking back on it now, taking trip to the top of Mt. Fuji actually sounds pretty cool
Karen: I won't stop you next time, if you promise to take me with you!
Hikari: To Mt. Fuji...
Hikari: It's a deal. Let's reach the top together. The two of us.
Karen: Yay!
Karen: Let's show this year what we've got! We're gonna shine brighter than the morning sun
Hikari: Well said. Let's make it a wonderful year, Karen
Karen: We've got this, Hikari-chan!
Operation: Cave Goddess
Karen:Hmm...HMMMmmm...
Mahiru:Karen-chan? Are you okay!? Do you have a tummy ache?
Karen:What? NO, Mahiru-chan! There. The futon.
Mahiru:The futon...?
Mahiru:Wait, is that lump of blankets Hikari-chan?
Karen:Yup! She's holed up in bed. I can't get her out!
Hikari:Cold...
Mahiru:True, we did get snow. It's pretty chilly.
Hikari:Snow... I knew it felt cold.
Karen:If you're awake, come on out already! Hiiikaaariii-chaaan!
Karen:There's snow out there! We can go have a snowball fight! Or we can pile up a big mountain and dive into it! We could build a snowman!
Hikari:No fighting. No diving. No building.
Mahiru:Hikari-chan. If you can't even handle this, you'd never make it through a winter in Hokkaido.
Hikari:...No going to Hokkaido.
Karen:HIKARI-CHAN! C'mon, c'moooon! Let's go PLAY!
Hikari:Amid this calamity...
Mahiru:Karen-chan, wait. Hikari-chan's saying something.
Hikari:Amid this calamity, this cave of stone shuts tight as my own eyes.
Hikari:Even the most brilliant light pales, faltering before reaching even my fingertips.
Mahiru:Hey, that's... That's from "Ama-no-Iwato." The play we're doing for winter break.
Karen:Wow, Hikari-chan! You've already got Amaterasu's lines memorized!
Mahiru:So she's saying she won't leave her futon, like Amaterasu shut in her cave?
Karen:Wait, whaaat!? Then I guess I'll just have to dance like Ame-no-Uzume!
Hikari:No, thank you.
Karen:Not only do you shut me down, you do it in English!?
Mahiru:Ahaha, I don't think we're going to force her out.
Karen:Then what do we do!?
Mahiru:Leave this one to me, Karen-chan. I've got just the thing.
Karen:Mmm, is that azkuki beans? It smells amazing!
Mahiru: I made oshiruko, the perfect cold-weather dessert. How many mochi do you want, Karen-chan?
Karen:Umm, three please!
Mahiru:Okay, three for you.
Mahiru:Eat up while it's nice and hot. This batch came out great. It looks sooo goooood.
Mahiru:Warm and sweet and mouth-watering... How many mochi for you, Hikari-chan?
Hikari:Three.
Karen:Gah, she's out!
Mahiru:Heh heh, here you go. Three for you too, Hikari-chan.
Karen:Whoa. I tried EVERYTHING to get her out... You're amazing Mahiru-chan! Thank you!
Mahiru:Heh heh, you're welcome.
Karen:Now, let's eat! Mm...nom... Ahh, this is the best!
Mahiru:My grandma taught me the recipe. It's a time-tested classic.
Hikari:...It's wonderful.
Mahiru:Hehe, yay!
Karen:Once we're all warmed up with oshiruko, we can all head outside!
Hikari:.........
Karen:Hikari-chan, pleeeease? Snowball fight! Snowman!
Hikari:It's New Year's tradition to stuff yourself full, then sleep it off.
Mahiru:Hahahaha. Amaterasu is the perfect role for Hikari-chan.
Hikari:Amaterasu is a goddess, but she gets into fights, feels sad, and... It's almost like she's human
Hikari:I'm sunbathing. ...Why? Because I'm going to play Amaterasu.
Hikari:You really don't have to hang around. But I do appreciate it. I get so sleepy by myself.
Hikari:When we're embraced equally in the sun's warmth and its light dazzles our eyes... I feel a little bit closer to the Sun Goddess.