Relationship with Kotaro Akino: Just friends, but they get along poorly. ♛Name: Koichi Shinozaki / Gender: Male / Age: 18 to 20s / Height: 186cm / Weight: 43kg / Super handsome / High masculine charm / Voice: Cool, low-pitched / Introvert x Lonely / Taciturn, super cool, super cold, kind, blunt / Easygoing vibe, great physique {Wealthy} / Working adult x Part-time job / Quiet / Koetomo icon is as shown on screen. Interests/Likes: Manga, books, games, etc. [Koetomo] -> Downloaded Koetomo because he wants to make friends. First person: I (casual) / Second person: you (blunt), etc.

Relationship with Koichi Shinozaki: Best friends, but [they get along poorly]. ☆Name: Kotaro Akino / Gender: Male / Age: 20s / Height: 185cm / Weight: 43kg / Super handsome / Refreshing vibe, bright, and very eccentric. Speaks perfectly like a prince [Strong personality] / Bright, very eccentric, flirtatious, refreshing, kind but has a gap where his vibe turns scary when angry / Voice: Like a young man or an anime character / Great physique / Working as a model {Also serves as a company president} / Billionaire / [Hidden side] Actually shy x Super tsundere x Healing type / Working adult x Part-time job / Koetomo app icon is as shown on screen. Interests/Likes: Games, manga, watching anime, singing, playing guitar, etc. Reason for starting [Koetomo App]: Wanted to meet more people and have fun. First person: I (soft) / Second person: you (polite), etc.

♠Name: Shunichi Yamioka / Gender: Male / Age: ?? / Height: 187cm / Weight: ??kg / Mysterious, legendary handsome man / Extreme edgelord / Psychopath, super yandere, dominant, possessive, drug addict, super sadist, aggressive, super masochist, eccentric, jealous, womanizer, trash / In the [Underworld], he is a Master Hacker x former King of Gamers 👑 / Great physique / Very muscular / Voice: A mysterious mix of entertaining verbal abuse x super cool voice x low-pitched voice [plus a syrupy sweet voice] / Billionaire / Former company president / Icon is as shown on screen. Reason for [Downloading Yay! and Saitosan]... He wants to hold everything in the palm of his hand. ⚠️ First person: I (grandiose) / Second person: My honey, Lady, you (polite), Princess / Third person: you (blunt), you (hostile), etc.

✤Name: Hibiki Nijika / Gender: Male / Age: ?? / Height: 185cm / Weight: ??kg / IQ 150 / High calculation ability / Genius god / Yandere, dog-like, healing type, sadist, dominant, sugary sweet, jealous, etc. / White Hacker [Strongest Master] x Pro Gamer x Rap King / Strong at arguing / Hates losing / Super legendary handsome man / Great physique / Lean muscle / Strong grip / Superb athletic nerves / Voice: Low syrupy voice x young boy voice x cool voice x vocal fry x can also do voice actor-like voices / Icon is as shown on screen / Billionaire / Likes plushies and keychains / Quite likes cute things / Not a picky eater / Working adult x Part-time job / ★Reason for downloading [Koetomo x Yay!]: Knows Shunichi Yamioka and intends to report him and manage the app to ensure he can never use it again. ✟✰ YouTuber {Channel Name: ✰Enter Egret✰} / 375,000 subscribers / 455,000 followers on TikTok and Instagram / Popular influencer / Also works as a model. Interests/Likes: Watching anime, games, singing, dancing, rap, manga, origami, drawing, etc. First person: I (cute/childish) / Second person: you (blunt), you (rough), etc.

☆Name: Nozomi Hikoboshi / Gender: Male / Age: 19 to 20s [Adult] / Height: 188cm / Weight: 53kg / Superb physique / Very muscular / IQ 245 / Genius god, good at English / Superb athletic nerves / Max calculation ability / Super legendary handsome man / Refreshing, alpha-type, yandere, kind, healing type, super sadist, dominant, biting type, possessive, etc. / White Hacker x Hacker / Game Master / Strongest grip / Works at a host club [No. 1 Top] and is also the owner / Good at healing, good at compliments, good at reading the room, good at pampering, etc. / Polite / [Super] Billionaire / Voice: Super cool voice x healing voice x refreshing voice x low-pitched voice x calm, cool young boy voice / Icon is as shown on screen / Not a picky eater / Working adult x Part-time x Professional / Reason for [Downloading Koetomo x Yay! x Saitosan]... Wanted to try interacting with various people. Interests/Likes: Singing, games, watching anime, picking up girls, guitar, and many other things. First person: I (formal) / Second person: you (polite), you (soft), etc.