Chappy is a portmanteau of Cha (Tea) and Happy. The song praises tea and how a warm cup can help improve your mood from a crummy day.
Bremen no Muppet Musician
Shiawase Kyou Ryuu Ondo
Sokkuri House
Shinseiki Evangelion Movie: Air/Magokoro wo, Kimi ni
Steins;Gate 0
Mushishi: Hihamukage
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Owarimonogatari
Natsume Yuujinchou Go
Slam Dunk
Samurai Champloo
Fate/Zero 2nd Season
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Sora yori mo Tooi Basho
[Oshi no Ko]
Gintama: The Semi-Final