Here's what rhymes with toseikai.
guy chi quae kai by my high why die lie thy y buy cry sky tie vi hi shy sigh bi bye dye fi hy nigh pi pie thai thigh vie dei ly psi rye ty wir awry hai lye mai muy nai wry cy fy lai luy mei sy tai thei wai phi dry try fly spy fry ply sly pry tri trie pri overlie sty aquae spry stye overbuy slier apply supply thereby deny rely hereby defy goodbye pacify belie decry untie descry ossify amebae blowfly turfy lanai overfly scurfy shanghai reply imply justify nearby occupy whereby comply nuclei specify alkali signify testify verify certify notify alibi samurai pupae termini terrify typify amoebae codify edify vilify bonsai deify firefly retry triply vivify horrify stupefy versify barfly drachmai ripply banzais satisfy clarify modify qualify classify butterfly glorify gratify purify underlie alveoli diversify fortify magnify nullify ratify rectify standby unify beautify falsify lullaby crucify dignify liquefy mollify oversupply personify ramify resupply acidify mystify calcify misapply petrify liquify scarify mummify prettify vitrify beatify speechify dandify yuppify identify stimuli simplify intensify quantify amplify solidify mortify demystify detoxify preoccupy stratify stultify ultrahigh emulsify reunify revivify cumuli dissatisfy declassify hyperbolae gentrify refortify syllabify multiply disqualify indemnify objectify dragonfly electrify reclassify solemnify exemplify oversimplify transmogrify misidentify