Hidden within the brilliance of gemstones are mysterious stories you may not know about. Hinatako works at a jewelry specialty store in Ginza. Every day, customers come to the store bringing in gemstones with mysterious secrets. While working with appraiser Teruya to appraise the gems, the unknown stories of the gems are revealed... (Source: Akita Shoten, translated)

https://mechacomic.jp/books/250436

Spica, a saint born with healing powers, is betrothed to the second prince, Hadal, due to the rarity of her power. Spica devotes herself to her country, but one day, her engagement is annulled. With advances in potion technology, healing powers are no longer necessary—Spica is banished with these words. Now a "useless saint," Spica decides to create potions for her family and to heal those who are hurt...! When Spica tries making a potion, she creates a secret medicine imbued with the saint's magical powers that has XX effects...!? The potions she enjoyed making are needed by people, and Spica regains her confidence, but her situation changes completely when she saves the prince of a neighboring country!! "Why not become a court pharmacist...?" The story of a banished saint's dramatic reversal begins! https://www.cmoa.jp/title/351720/

"This is just practice, okay?" Charlotte is a slightly eccentric duke's daughter who loves gardening. Crown Prince Joele, her cousin, has been visiting her frequently hoping she'll fall for him, but his feelings have not come across at all. When Charlotte decides to start husband-hunting to help her family's financial troubles, Joele seizes the opportunity. He invites her to stay at the royal castle and attend a ball. Having successfully brought her closer, he begins to teach the inexperienced Charlotte what love is, step by step. After all, she needs to learn how to handle being alone with a man, right? https://www.cmoa.jp/title/350487/

Shigeru Mizuki's debut work as a manga artist and was released as a rental manga. Dr. Uetsuto departs via rocket to investigate a second moon that appeared in the night sky, but the rocket is sabotaged by his rival Dr. Dorai, so it crashes and Uetsuto's corpse sinks to the bottom of the sea. However, right before the crash, Uetsuto came into contact with a mysterious being named Guraya who enters his body like a parasite, causing Uetsuto to later resurrect and with superpowers. Uetsuto becomes the mysterious hero Rocketman and battles against Dr. Dorai's giant robot Neo-Dorai. (from gegegenokitaro.fandom)

Several years ago, Kotetsu of the cat-like alien race Nyanglien, came to Earth as a spy for an undercover investigation. As if that wasn't strange enough, he was found-out by a human, Nase, who welcomed him warmly and now Kotetsu spends his time living a comfortable day-to-day life―!? (Source: Ichijinsha, fan translated) Episode 1: https://ichicomi.com/episode/12207421983458803656

“How dare you become happier than us.” Renael, the second daughter of a count’s family, spends her days cleaning up after her selfish sisters. Then one day, a woman driven mad after having her lover stolen by Renael’s younger sister nearly kills her. Having finally reached the limit of her patience, Renael decides to leave her family behind for good…! After being saved from danger by the crown prince, she becomes his secretary at his request. There, the talents she had long suppressed begin to shine unconsciously, captivating the people of the royal palace one after another. Meanwhile, the happy lives of the sisters who lost Renael begin to fall apart… Want her help now? Sorry, she’s too busy enjoying her freedom! A dramatic comeback story of a plain, supposedly talentless noble girl finding her true place and seizing happiness! _Source: Berry's Cafe, translated (Original novel)_