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Almost all new laptops will run VN's and movies without an issue - but I'd recommend Windows / Microsoft as you'll run into compatibility issues with VN's and Mac's / Apple's. Usually the only issues with movies is having the right program / codecs, but that's solved by software. Regarding VN's, the best way to be completely sure would be to print off recommended specs of a few and take it to the store with you and ask the employee, or you could ask on reddit or discord with some more details like your budget, what screen size you'd prefer, etc. If it helps I think the general type of laptop you're looking for is known as a "Multimedia laptop". You could even get away with a true budget laptop if you don't plan on using it for more than 2-3 years and don't mind it being a bit slower / less multitasking ability.

When you search for a JP VN walkthrough, you'd better begin by https://seiya-saiga.com/ , as theirs are mostly the better and are accompanied by advices, full saves, basic infos etc. Here's the page for H2O～FOOTPRINTS IN THE SAND～ : https://seiya-saiga.com/game/makura-soft/h2o.html

https://2dfan.org/topics/3749 There's really nothing that requires a guide there, but here

If you paid attention to twitter lately, you might have seen that we announced a group called Fleeting Heartbeat Studios! We can proudly announce that those are our new partners, too! These are the folks behind the modern Katawa Shoujo Re-Engineered, which you might call a remaster of the old classic Katawa Shoujo. This group had the goal to recreate Katawa Shoujo with Renpy8.0 codebase, Accessibility Features, upscaled graphics and other things that the modern game engines would offer, so they made it reality! If you want to hang out with the folks behind this remastered version, you can check out their website and their discord server! They inexhaustively work that Katawa Shoujo can be both accessed and enjoyed by everyone in its new form. We also held an interview with their chief, Local Man. Links: Website Discord: Join here