It's a shorter set compared to usual, but it checks out. Support the artist:
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_213926/

Text: 2-324
Clean: 325-647

thanks for the upload hellclerk , sent you message on forums

Base +4

Age regression- Apparently, the lady on page 320 is a rejuvenated form of the old lady at the start(Kiku-san). Machine translation(I know), about rejuvenation and "Don't make fun of the elderly". I thought it was the other 'greyish' haired lady we see earlier, but she's in the background.

Shame, she only pops up at the very end and isn't in any scenes.

Base +6