Mermaid no Kisetsu

The setting is in the near future with technological advancements, but the living style didn't change that much.

One day you find a strange note with an address of a home page.

You check it out only to see the ominous warning text.

While you're not trying to figure out the mystery behind it, you will traverse town meeting various people, mostly girls and women, with whom you'll work on relationship to become friends with, or something more.

The core of the game is a romance visual novel with dialogues and occasional reply choices with full voice-acting for all the heroines as well as other side-characters.

An additional gameplay feature is that when you're home in your room, you can check the mysterious home page, as well as home pages of the girls you meet in town, reading info about them, checking their diaries and posts.

The game progresses through the days, always showing the day of week and the time of day, with ability to select your next location on the town map to progress the time, but you can only select to visit the places where other characters are, even if you avoid talking to them.

Mermaid no Kisetsu for PlayStation is currently worth €17.46 loose, €15.74 complete in box, and €41.12 factory sealed. Prices are based on real sales and update regularly on Gamevaro.

Mermaid no Kisetsu has only a handful of tracked market sales, suggesting relative scarcity compared to more common PlayStation titles.

Loose means cartridge or disc only, CIB (complete in box) includes the original box and manual, and sealed means factory-sealed and never opened. For Mermaid no Kisetsu, loose is €17.46 and CIB is €15.74 — CIB commands a premium because original boxes and manuals are fragile and often don't survive.