I forgot to do day 13 yesterday so I'll do both day 13 and day 14 today

Day 13 - Favorite Original Song by Hello, Happy World

My favorite one by far is Nico x Nico = Hyper Smile Power

Day 14 - Favorite Original Songs by Pastel*Palettes

My favorite so far would be a tie between Yura・Yura Ring-Dong Dance and Yume Yume Gradation

Credits to Riru for making this challenge board.