So I'mma start this cause why not

Day 1
Anime: ID: Invaded
Op: Sou by Mister Fixer

Day 2
Anime: Soul Eater
Op: Resonance by T.M. Revolution

Day 3
Anime: Clannad
ED: Dango Daikazoku by Chata

Day 4
Anime: FMAB
OP: Again by Yui

Day 5
Anime: Vinland Saga
ED: Drown by Milet

Day 6
Anime: Attack on Titan
OP: Feuerroter pfeil und bogen by Linked Horizon

Day 7
Anime: Gurren Lagann
OP: Sorairo Deizu by Shoko Nakagawa

Day 8
Anime: History strongest disciple Kenichi
OP: Yahho by Miho Morikawa

Day 9
Anime: D. Gray-man
OP: Innocent sorrow by Abingdon Boys School

Day 10
Anime: Attack on Titan
OP: Akatsuki no Requiem by Linked Horizon

Day 11
Anime: Haikyuu
OP: Fly High!! by Burnout Syndromes

Day 12
Anime: Hunter x Hunter
ED: Nagareboshi Kirari by Yuzu

Day 13
Anime: Code Geass
OP: Colors by Flow

Day 14
Anime: BECK
OP: Hit in the USA
What you should be doing: Reading and watching BECK

Day 15
Anime: Terror in resonance
ED: Dareka, Umiwo by Aimer

Day 16
Anime: Bleach
OP: Asterisk by Orange Range

Day 17
Anime: Jojo's bizarre adventure
OP: Fighting gold by Coda

Day 18
Anime: Bungou Stray Dogs
OP: Reason Living by SCREEN MODE

Day 19
Anime: One Piece
OP: We Are! by Hiroshi Kitadani

Day 20
Anime: The Devil is a part-timer
OP: ZERO!! by Minami Kuribayashi

Day 21
Anime: Carole & Tuesday
OP: Kiss me by Celeina Ann

Day 22
Anime: Blood Blockade Battlefront
ED: Sugar Song to Bitter Step by UNISON SQUARE GARDEN

Day 23
Anime: Cowboy Bebop
OP: Tank! by The Seatbelts

Day 24
Anime: Katekyo Hitman Reborn
OP: Easy Go by Kazuki Kato

Day 25
Anime: Black Clover
OP: Gamushara by Miyuna

Day 26
Anime: Sword art online
OP: Crossing Field by LiSA

Day 27
Anime: Goblin Slayer
OP: Rightfully by Mili

https://twitter.com/hoodpanelD/status/1244284816138350594?s=19

Day 29
Anime: Vampire Knight
OP: Futatsu no kodou to Akai Tsumi by Haketa Takefumi

Day 30
Anime: Elfen Lied
OP: Lilium by Kumiko Noma

Day 31
Anime: Jojo's bizarre adventure
ED: Freek'N You by Jodeci

Day 32
Anime: Hunter x Hunter
ED: Hunting for your dream by Galneryus

Day 33
Anime: Demon slayer
OP: Gurenge by LiSA

Day 34
Anime: Darling in the Franxx
OP: Kiss of Death by Mika Nakashima x Hyde

Day 35
Anime: Gintama
OP: Pray by Amanda Lee

Day 36
Anime: Gintama
OP: Sakura Mitsutsuki by SPYAIR

Day 37
Anime: Tokyo Ghoul
OP: Unravel by TK

Day 38
Anime: Dororo
OP: Kaen by Ziyoou-Vachi

Day 39
Anime: Vinland Saga
OP: MUKANJYO by Survive said the Prophet

Day 40
Anime: Fire force
OP: Inferno by http://Mrs.GREEN  APPLE

Day 41
Anime: K-ON!
OP: Cagayake! GIRLS by Sakurakou K-ON

Day 42
Anime: Code Geass
OP: World End by FLOW

Day 43
Anime: Mob Psycho 100
OP: 99 by Mob Choir

Day 44
Anime: Steins;Gate 0
OP: Fatima by Kanako Itou

Day 45
Anime: Magi
OP: V.I.P by SID

Day 46
Anime: Terror of Resonance
OP: Trigger by Yuuki Ozaki

Day 47
Anime: One Piece
OP: WE GO! by Hiroshi Kitadani

Day 48
Anime: Seraph of the end
OP: Orarion by Nagi Yanagi

Day 49
Anime: One Punch Man
OP: THE HERO!! by JAM project

Day 50
Anime: Fire Force
ED: Veil by Keina Suda

Day 51
Anime: Dr. Stone
OP: Good Morning World! by Burnout Syndromes

Day 52
Anime: Bleach
OP: Alones by Aqua Timez