きみと雨上がりを (After the Rain With You)
Full furigana: No
Summary
English (from bulbapedia)
“The world was beautiful, but it’s become far more beautiful ever since I met you.”
Nemona, the student council president of Naranja Academy in the Paldea region, shows Anna, a girl who has just moved in as her neighbor, the way to school. During a Pokémon battle soon after they meet, Nemona sees something glimmer deep in Anna’s eyes.
The skilled novelist, Ayano Takeda, depicts the story of the two’s “Treasure Hunt” from a unique perspective.
Japanese
パルデア地方のオレンジアカデミーの生徒会長であるネモは、近所に引っ越してきた転入生の少女・アンナを学校まで案内することに。 出会ってすぐのポケモン勝負で、ネモはアンナの瞳の奥にきらめくものを見る。 実力派作家・武田綾乃が独自の視点で描く、ネモとアンナの2人の「宝探し」の物語。
Availability
Free to read here.
Apparently you could get physical copies in the Pokemon Center stores, not sure if that is still possible.
Personal Opinion
The Pokemon games are a common recommendation for beginners as a way to get more familiar with the Japanese language. Since the franchise is targeted at children, the language tends to be very accessible and the content more wholesome and simple than complicated.
I had been out of touch with Pokemon for some years, not even playing the new games. But I have recently started watching the Pokemon Horizons anime as easy listening practice - and on recommendation of a friend started playing Pokemon White for the first time. Not sure how long this new Pokemon phase of mine will last, but when I heard about there being an official tie-in Pokemon novel - and it is free to read - I knew I had to read it! 
Pros and Cons
Pros
- Free to read!
- Browser extensions such as Yomichan work! Unfamiliar Vocab or lack of furigana won’t be an issue
- Written by the author of Hibike! Euphonium
- Likely a wholesome story about friendship
- Has an official Music Video by YOASOBI (who you might know from the Frieren or Oshi no ko Openings)
Cons
- Lots of “useless” Pokemon vocab like names of Pokemon, moves, locations etc.
- No physical copies from what I can tell
- No English translation to double check your understanding
- Is based on Pokemon Scarlet and Violet (might be a Pro?)
Pictures
I will spare you the screenshots. Check out the entire book here!