When Living in Fantasyland, You Must Abide by the Laws.

The young man had an invincible and powerful law sister who once provided his master with two abilities and a set of services, including transformation ability, summoning ability, and nurturing service. But before entering Gensokyo, his transformation ability was banned. The reason is this Rule of life: This trick is too perverted and has been reported. Then his summoning ability is limited, and the reason is this Rule of life: Don't dream of driving a star fleet, playing science fiction wars alone, and confidently conquering the moon. Later... The maintenance service ceased to exist. The reason is this Rule of life: support? Now you have been taken care of by me, do you understand? I just want to be a silent melon-eater, watching you, the stinky* air that pollutes the world's environment, making a bunch of nonsense. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.