Mirai Nikki
Assassination Classroom
Fairytail
Your Lie in April
Shokugeki no Soma
K-On
Orange
Okusama ga Seitokaichou
Your Name
K Project
Coppelion
A Certain Scientific Railgun
Barakamon
Non Non Biyori
Yuojo Senki
Made in Abyss
nah... they only end up getting bored of you 10 years later and you have to learn to live by yourself after that... if you want a best friend get a dog
Well that's true but you'll also get chances to meet some new people instead so there's no need to worry about that. ^-^
I do agree with Bunny-san though, you should try to make yourself as strong as possible as an individual. In the end we'll always end up alone so better get comfortable about it.