The most wholesome shows would probably be:

• Karakai Jouzu no Takagi-san
• Kubo-san wa Mob wo Yurusanai
• Soredemo Ayumu wa Yosetekuru

But if you don’t mind just a little bit of drama or tears definitely I recommend those:

• Boku no Kokoro no Yabai Yatsu
• Golden Time
• Nisekoi
• Fuufu Ijou, Koibito Miman
• Plastic Memories