Kyūjitai form of 三蔵 (“Tripitaka”)

total concentration in something, being totally absorbed insomething

immersing oneself in something completely, totally absorbing oneself in something

deep, profound

hidden / concealed / secret

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

to research, to study

a piece of research, a study, investigation

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend