Alcohol and Ogre-girls
Ongoing | hashiba minori,zinbei | 2019 released
Shimekiri Mae niwa Yuri ga Hakadoru
Ongoing | hirasaka yomi,sakida saki | 2019 released
The age gap is apparently 6-7 years, mc is 16 and her supposed romantic interest is likely 22-23. Mc seems to like her from the first sight. Personally, I do not think such an age gap is that frightening, many married couples have age difference like that. Of course, mc is a bit too young, but, if there is no pressure, manipulation or other malicious intents involved, I don't find it that catastrophic. After all, in many developed countries 16 is the age when person is deemed capable to have their own romantic experience. If the young person is reasonable and can think for themselves It seems okay.
Ojou-sama wa Love Come no Shujinkou ni Naritai!
Ongoing | watari sae | 2000 released
The Heroine and the Princess
Ongoing | Mutsuki wakamiya | 2019 released
Tokubetsu na Chuutohanpa
Ongoing | dosukoi , ドスコイ | 2019 released
Gakuen Police