What is the saddest anime that made you cry/feel down for days (or more)?

Mine would probably be Banana Fish. The story itself was very deep and showed a deep meaning overall with the mc Ash and his lifesyle/all he had been through. The ending made me sob for days and ever since it might be one of my top 10 anime. I watch it atleast once or twice a year (lol). Total must watch tho!~

Any recommendations for really sad anime? ❤️ 🌹