"X to Y" means that it is a one-way, conveying X's opinion of their relationship to Y.
"X and Y" means it's a mutual relationship.
"X and Y and Z to A" should be read as "[X + Y + Z] to A".
Allen and Hajun: Trust
Allen to Anne: Yells at me a lot
Anne to Hajun: You have a nice face, but... lol
Anne to Saimon: Sensei ♡
Saimon and BAE: Teacher and Students
Saimon to Shiki: Watching over you
Saimon to Ryu: Watching over you
Saimon and Yohei: A duo that goes way back
Yohei to Ryu: Wrangles
Ryu to Saimon: Boss
Ryu to Yohei: Master
Ryu to Shiki: Bestest buddy
Shiki to Ryu: A little scary, but kind
Shiki to Kanata: Scary...
Nayuta to Kanata: Precious older brother
Kanata to Nayuta: I will protect you
Iori to Zen: Right hand man
Iori to Kanata: Hires to do shady jobs
Zen to Iori: Respect
Hokusai to Satsuki: Cute
Hokusai to Reo: Cute
Hokusai to Ryu: Cute like a kitty
Satsuki to Iori: Role model
Satsuki to Zen: Kind of overbearing...!
Satsuki and Reo: Seem to still be close, even though they fight constantly?
Satsuki to Anne: It's not like I like you or anything!! (Massive crush)
Kei to Rokuta: Precious little brother
Kei to Itsuki: Trust
Kei to VISTY: Former member of VISTY
Itsuki to Kei: Grateful to you for taking me in
Itsuki to Rokuta: Grew up in the same research facility
Rokuta to Kei: You're nice so I like you!
Rokuta to Itsuki: You're like a big brother
Rokuta and Itsuki to Ryu: Grew up in the same research facility
Allen and Hajun: Trust
Allen to Anne: You're scary when you get mad
Allen to Kanata: A passionate guy who makes good music
Hajun to Anne: You have good taste
Hajun to Dongha: Half-brother
Anne to Saimon: Sensei ♡
Kanata to Nayuta: I will protect you
Kanata to Allen: You're annoying, leave me alone
Kanata to Iori: Annoying, but a good source of money
Kanata to Zen: Painfully overbearing
Nayuta to Kanata: Precious older brother
Dongha to Hajun: Half-brother (loathed)
Dongha and Chungsung: Master and servant
VISTY to Kei: VISTY's original center
Shogo to Aoi: You're younger than me, but you're reliable
Shogo to Kantaro: Maybe ego-search a little less?
Shogo to Toma: Sorry for all the trouble
Toma to Shogo: You good?
Toma to Aoi: I feel like you're keeping some kind of secret
Toma and Kantaro: Selfie buddies
Toma to Hajun: Fellow model; respects
Aoi to Shogo: You shouldn't keep things bottled up
Aoi to Toma: You're good at taking care of others, aren't you?
Aoi to Kantaro: You're really high-maintenance...
Aoi to Anne: I want to be like Anne-sama
Kantaro to Aoi: Thanks for everything ♡
Kantaro to Shogo: I'm counting on you!
Saimon and BAE: Teacher and students
Saimon and Yohei: A duo that goes way back
Saimon to Shiki: Watching over you
Saimon to Ryu: You're certainly unique. It's fascinating.
Yohei to Ryu: Wrangler
Yohei and Iori: Former buddies
Ryu to Saimon: Boss
Ryu to Yohei: Master
Ryu to Shiki: A friend and a snack ♡
Ryu to Itsuki and Rokuta: Who're you?
Ryu to Hokusai: Friend to go on walks with
Shiki to Saimon: Respect
Shiki to Yohei: Sometimes scary, but kind
Shiki to Ryu: A strange person, but also a precious friend
Shiki to Kanata: Scary...
Shiki, Hokusai, Satsuki, and Reo: Go to the same high school
Iori to Zen: Right-hand man
Iori to Kanata: Hits up for shady jobs
Zen to Iori: Respect
Zen to Yuto: Horror
Hokusai to Iori: Respect
Hokusai to Satsuki: Cute
Hokusai to Reo: Cute
Hokusai to Ryu: Companion on walks. Cute.
Satsuki to Iori: Role model
Satsuki and Zen: Workout buddies
Satsuki to Anne: It's not like I like you or anything!! (Massive crush)
Satsuki and Reo: Seem to still be close, even though they fight constantly?
Satsuki to Ryoga: You betrayed me!
Reo to Iori: Beloved aniki
Reo to Hokusai: Close friend
Reo and Satsuki and Hokusai: Like brothers
Yuto to Zen: We worked together during our days on the police force
Shion and Kenta and Ryoga to Yuto: Prison guard
Yuto to Shion and Kenta and Ryoga: Please just try not to cause any trouble, okay?
Ryoga to Shion: Trust
Ryoga to Kenta: Trust
Ryoga to Satsuki: Old friend
Shion to Ryoga: Our interests happen to align
Shion to Kenta: You really are a child, aren't you?
Kenta to Shion: Horndog.
Kenta to Ryoga: As far as muscleheads go, you're alright
Ryoga and Shion and Kenta: Prisoners
Buraikan
Leader: Chisei || Trackmaker: Haruomi
Chisei and Haruomi: Partners
AMPRULE
Leader: Dongha || Trackmaker: Chungsung
Dongha and Chungsung: Master/Servant
Dongha and Hajun: Half-brothers
cozmez
Leader: Kanata || Trackmaker: Kanata
Kanata and Nayuta: Twins
Akan Yatsura
Leader: Iori || Trackmaker: Hokusai
Satsuki to Anne: The one he has a crush on
Satsuki and Ryoga: Neighborhood friends
Satsuki, Hokusai, and Reo: Sworn brothers
Iori to Zen: Trusted right-hand man
Iori to Anne: CANDY's top-earning cast member
Iori and Yohei: Former buddies
Zen and Yuto: Former colleaues from the police force
BAE
Leader: Allen || Trackmaker: Allen
Allen to Buraikan: Huge fan
Allen and Anne and Hajun: Go to the same university and live together
Hajun and Toma: Modeling friends
BAE and Saimon: Students and professor
VISTY
Leader: Shogo || Trackmaker: Kantaro
Shogo, Aoi, Toma, and Kantaro: Living in the same sharehouse
VISTY to cozmez: The ones they admire
The Cat's Whiskers
Leader: Saimon || Trackmaker: Yohei
Yohei and Saimon: Former members of XXXX ("Quadra-X")
Shiki and Ryu: Roommates
Ryu and Itsuki and Rokuta: Human experimentation subjects
1Nm8
Leader: Kei || Trackmaker: Kei
Kei and Rokuta: Brothers
Rokuta and Itsuki: Met at the research institute
GokuLuck
Leader: Yuto || Trackmaker: Kenta
Ryoga, Shion, and Kenta: Prisoners
Yuto to Ryoga and Shion and Kenta: Let's get rehabilitated!
Ryoga and Shion and Kenta to Yuto: Shitty guard
ILLGATOR
Leader: Noah || Trackmaker: Meno
Noah and Akito: Living together
Noah and Akito and Meno: Interests happen to coincide
Akito to Ryu: ???