Tagged multiple lovers

What would you do if you could summon your favorite anime characters into reality? For Toma, that question suddenly becomes very real. After being transported to another world, he obtains a mysterious Summoning System capable of exchanging points for abilities, equipment, monsters, and items from countless fictional worlds. His first Random Summoning Coin gives him Tohka. His card packs can contain monsters like the Blue-Eyes White Dragon. And mysterious Dungeon Keys can send him into entirely different worlds to complete missions and obtain even greater rewards. Magic? Battle Aura? Monsters? Kingdoms? None of that matters. Because while everyone else is limited by the rules of this world, Toma has the entire multiverse behind him.

People get a magic ring which makes all living things agree with them.

After a rough highschool experience, you decide to overcome your fears and surpass yourself in every possible way, changing the rules of your school to do everything you ever wanted with all of your pretty classmates, and even your hot teachers. Inspired by Summertime Saga.

A 19 year old "scientist" tries making a drink to help his confidence. Things go...sort of that way. Includes deities and heavy science falsehoods.