Recommendations about places of my interests

Hi guys! So, I have a scheduled flight in Japan in just a few weeks. And I am wondering if you have recommendations about places of my interests? First, I am so into games! I have been a fan of marvel ultimate https://mua3.jp/game/best-xmen-heroes/ for a while and I hope to know which cities have cheaper prices of marvel merchandise? Second, I have recently found myself interested in japanese urban legends. Do you guys have any stories or suggested places where I could learn more about them? The recent story that chills me was about Hachishakusama, a manipulative demon and children-eating ghost.

Nakano Broadway for all things pop culture. Inner west Tokyo. This website has a little info on it.

X-Men is part of Marvel, as you are aware, but Marvel is not a Japanese company. You might find something you are interested in, but Japan is not the best country to be searching.

Heaps of selection in Mandarake, Book off store etc. Just a look online shows 1000s of availavle Marvel and X-Men item. Being non Japanese has nothing to do with it.

「マーベル・スタジオ／ヒーローたちの世界へ」大丸東京店　11階催事場
緊急事態宣言の発出を受け、開催を中止しているかも知れませんが、ネットでグッズを見ることが可能です。
1番安い商品で440円でした。

Marvel Studios to the World of Heroes" Daimaru, Tokyo Store 11th floor

It may have been an emergency declaration and has been canceled, but it is possible to see the goods online.

It was 440 yen for the cheapest product.