I'm not sure specifically what the'sama sama letter day story' is about as it's not a widely known common story. It could be a very personal or a story from a specific local or cultural context.
The Kaguya-sama manga is indeed finished. It ended after a successful run, leaving fans with memories of an engaging and enjoyable story. The final chapters tied up loose ends and delivered a conclusive ending.
Yes. The Kaguya-sama manga has reached its conclusion. It provided a satisfying ending for fans. The creator wrapped up the plotlines and characters' arcs neatly.
Sorry, I'm not very familiar with the specific 'ulala session love fiction' song lyrics. You can try to search for it on music platforms where you might find detailed lyrics explanations.
You could also check on social media platforms. There might be fan pages or groups dedicated to 'ulala session' where fans share and discuss things related to the band, including the lyrics of 'love fiction'. Additionally, YouTube music videos of the song may have the lyrics in the description or as captions, which can be a convenient way to access them.