https://www.dlsite.com/maniax/work/=/product_id/RJ415978.html

I don't understand how it's a trial version. Is he gonna add more characters later? Did I pay for a demo?

4: Konami Lady (Konami Wai Wai World)
5: Princess Sakura (Ninja Jajamaru-kun)
6: Sylvia (Kung-Fu Master/Spartan X)
7: Mary (Dengeki Big Bang!/Clash at Demonhead)
8-9: Lucia (Wing of Madoola)
10-11: Ikko Momomi (Idol Hakkenden)
12: The nurse next to your dying father at the start of the game (Idol Hakkenden)
13-14: Princess Cats (Super Chinese)
15: Goddess of Puff-Puff (Dragon Quest 11)
16: Serena (Little Devil's Dress) (Dragon Quest 11)
17: Grand Master Pang (Dragon Quest 11)
18: Midia (Fire Emblem: Shadow Dragon and the Blade of Light)
19: Eremiya (Fire Emblem: New Mystery of the Emblem)
20: Chun-Li (Street Fighter)
21: Yang Yun (Eternal Melody)
22: Tyutti Noorbuck (Super Robot Wars OG: Masō Kishin)
23: Rebecca Turner (Super Robot Wars OG: Masō Kishin)
24, 49: Izuna (Izuna: Legend of the Unemployed Ninja)
25: Shino (Izuna: Legend of the Unemployed Ninja)
26-27: Honmanimo (Makeruna! Makendo Z)
28: Io (Code Vein)
29: Kazemon (Digimon Frontier)
30: Rouge (Gunbird)
31: Female Lawyer (Simple V Series Vol 2: The Tousou Highway Full Boost: Nagoya-Tokyo Gekisou 4-Jikan)
32: Suzaku (Goemon's Great Adventure)
33: Android 18 (Dragon Ball Z)
34: Ino Yamanaka (Naruto)
35: Sarada Uchiha (Boruto)
36: Koto (Yu Yu Hakusho)
37: Fubuki Himekawa (Y School Heroes)
38: Ramune/Lemon Fizz (Bobobo-bo Bo-bobo)
39: Inbee (Bobobo-bo Bo-bobo)
40: Yae (Ganbare Goemon (Comic Bonbon manga version))
41-42: Lou Zhenhua (Chaos Dragon: Sekiryū Sen'eki)
43: Mystery Girl (Sword Hunter)
45: Monique Cadillac (Mobile Suit Gundam MS IGLOO)
46: Ying (Paladins)
47: Aska (Teenage Mutant Ninja Turtles: Tournament Fighters (SNES version))
48: Sakura Haruno (Naruto)
50: Darkness Lover Candy (Tengai Makyō: Daiyon no Mokushiroku)
51: Princess Daisy (Super Mario)
52: Girigiri Purin (Bakkotsu Shōjo Giri Giri Purin)
53: Kyoko Inaba (Jigoku Sensei Nūbē)
54: Miki Hosokawa (Jigoku Sensei Nūbē)

55-221: Dialogue and commentary
222-241: Omake

As far as I can tell according to the intro text, the "trial" bit is supposed to be referring to the fact that this includes just a little bit of art from a lot of different sources. You try them here and find more dedicated stuff for the people you liked.

Base +7, Writefag +6

@shiranai That makes a lot of sense. Thanks for clearing it up.

Base +5, Writefag +6